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Anna: Welcome to a new episode of Astronomy Daily.

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I'm Anna, and today we're diving into some

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truly fascinating developments from across

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the cosmos. We have a packed show exploring

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everything from relics of the space race to

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cutting edge astronomical research. Coming

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up, we'll update you on a story I brought you

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last week as we track a, uh, Soviet Venus

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probe making its return to Earth after more

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than 50 years in orbit. Then

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we'll examine China's bold plan to sample

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Venus's toxic atmosphere. We'll also

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explore how the upcoming Roman Space

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Telescope will hunt for mysterious rogue

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planets wandering through our galaxy without

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a star to call home. Plus, we'll hear about

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an ingenious satellite rescue mission using

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gravity as a slingshot. And finally,

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look at new data that might challenge

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Einstein's theories about dark energy. It's

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an exciting day in space science, so let's

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get started.

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To kick things off, let's get an update. In

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the early 1970s, as the space race between

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the United States and Soviet Union was in

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full swing, the Soviets launched an ambitious

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mission to explore our nearest planetary

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neighbor. The Cosmos 482

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probe was designed to land on the

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inhospitable surface of Venus, protected by a

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3.3-foot wide titanium shell lined with

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thermal insulation. Launched in

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1972, the mission unfortunately never

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reached its Venusian destination. A

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rocket anomaly during launch left the

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spacecraft stranded in an elliptical orbit

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around Earth, where it has remained for over

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five decades, silently circling our planet

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as a relic of early space exploration.

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That lengthy orbital journey appears to be

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coming to an end. The 1,190

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pound spacecraft is expected to re enter

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Earth's atmosphere shortly, with new

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predictions suggesting it would return around

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1:54am um, Eastern Time on May 10,

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though with a substantial margin of error of

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plus or minus nine hours due

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to its orbital path. Scientists calculated

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that the craft could re enter anywhere

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between 52 degrees north and 52

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degrees south latitude, a zone covering most

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of Earth's surface. This created some

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uncertainty about exactly when and where the

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probe might return. However,

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experts stressed there was little cause for

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concern. Unlike other space debris that

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often breaks into multiple pieces, Kosmos

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482 was expected to remain largely

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intact during re entry, presenting

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a lower risk profile. As the

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Aerospace Corporation noted, while the risk

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is non zero, any one individual on Earth

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is far likelier to be struck by lightning

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than to be injured by Kosmos

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482. Astronomers and

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satellite trackers have been monitoring the

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probe for years. Astrophotographer Ralph

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Vanderburg of the Netherland has captured

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images of the craft for over a decade,

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recently photographing what some speculated

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might be a deployed parachute, though other

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experts attributed this to optical

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distortion. Cosmos 482

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represents an important chapter in Venus

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exploration history. It was part of the

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Soviet Union's groundbreaking Venera program,

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which achieved remarkable firsts, including

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landing the first probe on Venus's surface in

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1970 with Venera 7, and later

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capturing the first color images from the

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planet's surface with Venera 13 in

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1982. As this cold

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War artifact makes its final journey, it

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serves as a testament to the ambitious early

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days of planetary exploration and the

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technological challenges involved in

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venturing to our most extreme neighboring

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world.

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While on the subject of Venus, China

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has set its sights on one of the most hostile

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environments in our solar system with an

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ambitious new plan to collect samples from

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Venus's toxic atmosphere and return them to

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Earth. This joint initiative involves several

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major Chinese space organizations, including

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the Chinese Academy of Sciences, the China

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National Space Administration, and the China

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Manned Space Engineering Office. The

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mission is tentatively scheduled for launch

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somewhere between 2028 and

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2035, though specific

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details about the methodology remain limited.

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What we do know is that the mission faces

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extraordinary challenges and due to Venus's

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extreme environment, a planet where

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surface temperatures reach nearly 900 degrees

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Fahrenheit, atmospheric pressure is 90

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times that of Earth, and the air consists

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primarily of carbon dioxide with clouds of

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sulfuric acid. Despite these hostile

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conditions, Venus continues to intrigue

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scientists, particularly after recent

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research suggested that microbial life could

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potentially exist there in some form. This

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Chinese mission aims to help settle that

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debate by bringing actual atmospheric samples

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back to Earth for detailed analysis.

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The mission will also investigate one of

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Venus's most puzzling features, how its

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clouds apparently absorb ultraviolet

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radiation when, according to our

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understanding of physics, they shouldn't be

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able to. This mysterious

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phenomenon has generated several scientific

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hypotheses that this mission could help

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confirm or rule out. Based on

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preliminary information, the ambitious

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undertaking will likely require at least two

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spacecraft working in tandem. One vessel

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would remain in orbit around Venus, while

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another would brave the planet's intensely

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stormy conditions, descending into the

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atmosphere to collect gases and particles

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before returning the samples to the orbiter.

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A similar concept was previously proposed by

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researchers at the Massachusetts Institute of

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technology in 2022, though NASA

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ultimately didn't select it for development.

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That design featured a Teflon coated

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corrosion resistant balloon that would carry

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a collection canister through Venus's clouds

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before sending the samples back to orbit and

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eventually, Earth. The value of returning

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physical samples to Earth cannot be

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overstated. Laboratory facilities here would

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allow for far more sophisticated and

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comprehensive analysis than any spacecraft

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could perform on its own at Venus.

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However, the technical challenges of

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accomplishing this across tens of millions of

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kilometers presents extraordinary

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engineering hurdles. While several

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Russian probes did successfully land on

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Venus's surface in previous decades, they

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only survived for a couple of hours before

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succumbing to the extreme conditions, and

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none attempted a return journey. If China's

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mission succeeds, even with just a small

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sample of Venus's atmosphere, it would

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transform our understanding of Earth's

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nearest planetary neighbor and potentially

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provide insights into the evolution of our

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own world's climate and atmosphere.

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Next up, have you ever wondered about planets

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that don't orbit stars? Astronomers call

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these wandering worlds rogue planets, and

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they might be more common in our galaxy than

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we ever imagined. The upcoming Nancy Grace

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Roman Space Telescope is poised to

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revolutionize our understanding of these

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mysterious cosmic nomads. Over the

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past decade, scientists have speculated

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extensively about rogue planets in the Milky

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Way. These free floating worlds don't have a

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home star providing them warmth and light.

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Instead, they roam through the vastness of

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interstellar space, ejected from their

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original star systems with current

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technology, they're incredibly difficult to

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detect precisely because they don't shine or

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reflect light like planets orbiting stars.

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Astronomers estimate the Milky Way could

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contain millions or possibly billions of

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these planetary wanderers. If those numbers

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prove accurate, there could be more rogue

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planets in our galaxy than there are planets

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orbiting stars, a truly mind boggling

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possibility. Without the warming influence of

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a star, these worlds are likely frozen,

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icy, and seemingly inhospitable.

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The Roman Space Telescope will employ a

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specialized search called the Galactic Bulge

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Time Domain Survey to detect these elusive

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objects. Scientists expect this survey will

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help them find anywhere from several hundred

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to several thousand free floating planets,

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providing an unprecedented census of these

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mysterious worlds. Roman will use both the

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transit method and microlensing to spot these

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rogues. The transit method detects the

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dimming of light when one object passes in

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front of another. Microlensing, meanwhile,

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observes how gravity from a foreground object

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will warps the light from a background star,

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creating a distinctive pattern that can

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reveal even non luminous objects like rogue

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planets. What's particularly

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exciting is that Roman might help answer

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fundamental questions about how these planets

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form and get ejected from their original

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systems. The dynamics of early

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planetary systems are chaotic, with

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gravitational forces sometimes flinging newly

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formed planets out into interstellar space.

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By analyzing the mass distribution of rogue

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planets, scientists can better understand

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these formative processes. The telescope

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will be especially valuable for detecting

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smaller rogue planets, worlds less massive

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than Earth that have previously escaped our

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notice These smaller planets would

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theoretically require less energy to eject

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from their star systems than their larger

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counterparts, potentially making them the

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most common type of rogue planet. Though

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the Roman telescope is still a couple of

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years from launch, astronomers are already

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anticipating the transformative impact its

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observations will have beyond rogue planets.

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It might even detect other non luminous

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objects wandering through our galaxy,

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potentially including primordial black holes.

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When it comes to understanding the full

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population and characteristics of objects in

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our galaxy, the Nancy Grace Roman Space

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Telescope promises to fill in crucial gaps in

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our knowledge, helping complete the cosmic

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census of our galactic neighborhood like

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never before.

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Next Today, more Chinese space news. In what

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can only be described as an impressive

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display of cosmic problem solving, China's

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Technology and Engineering center for Space

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Utilization recently pulled off a remarkable

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rescue mission in space, saving a pair of

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wayward lunar satellites through an ingenious

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gravity slingshot technique. Back in March

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2024, China launched two satellites named

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Dro A and Dro B aboard a Long

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March rocket. These satellites were

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destined for what's called a, uh, distant

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retrograde orbit around the moon. That's what

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the DRO in their name stands for. Their

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mission was to provide navigation and

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tracking for spacecraft operating in Earth

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Moon space, essentially serving as celestial

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lighthouses. While the rocket's first and

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second stages performed flawlessly, a

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technical issue with the Yuan Zheng one's

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upper stage prevented the satellites from

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reaching their intended orbit. To make

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matters worse, mission control temporarily

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lost contact with the duo entirely.

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When the team finally located the satellites,

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they discovered the pair were spinning in an

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orbit much closer to Earth than planned.

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This could have spelled disaster for the

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mission, with years of work and significant

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investment potentially wasted. As

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Zhang Hao, a member of the rescue team,

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explained, it would also be a mental blow to

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the team. The challenge was particularly

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complex because the satellites had sustained

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partial damage during the launch, limiting

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their ability to capture enough sunlight to

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power the necessary course correction. This

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is where the team's creativity truly shined.

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Rather than attempting to force the

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satellites into position using their limited

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power resources, engineers devised a

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plan to use the natural gravitational forces

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of the Earth, moon, and sun to gradually

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slingshot the satellites toward their

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destination. This gravity assist

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technique essentially borrowed energy from

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these celestial bodies rather than relying on

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the satellite's own limited fuel reserves.

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As UH CSU researcher Mao Xinyuan put it,

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if you don't want to consume much energy, you

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must replace it with something else. We chose

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to consume more time in order to save energy.

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The patience paid off, though. The rescue

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operation took a substantial 123 days to

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complete by mid July 2024,

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both satellites had successfully reached

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their intended orbits around the moon. And

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about six weeks later, DRO A and DRO

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B separated from each other as planned.

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They're now working alongside a third

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satellite, drol, which had previously

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launched to low Earth orbit. Together, these

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satellites form a navigation network that can

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dramatically reduce the time needed to locate

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spacecraft in Earth Moon space. According to

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Mao, they can now pinpoint a spacecraft's

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position in just three hours compared to the

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two days or more required by traditional land

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based positioning systems. This

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remarkable save demonstrates not only China's

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growing expertise in space operations, but

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also the ingenuity that makes space

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exploration possible even when things don't

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go according to plan.

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And wrapping things Up Today,

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some of the most fundamental aspects of our

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universe may be up for reconsideration,

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as recent findings from the Dark Energy

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Spectroscopic Instrument, or dece,

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suggest that dark energy, the mysterious

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force thought to be driving the accelerated

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expansion of our cosmos, might not be

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constant after all. This potential

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discovery challenges one of modern physics

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cornerstone ideas. Einstein's

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cosmological constant. For those unfamiliar

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with the history, Einstein originally

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introduced this concept in 1917 as

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an addition to his equations of general

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relativity. At the time, he was trying to

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create a model for a static universe, one

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that neither expanded nor contracted. When

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astronomers later discovered the universe was

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indeed expanding, Einstein reportedly called

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the cosmological constant his greatest

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blunder. Fast forward to the 1990s,

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when astronomers made the shocking discovery

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that the universe wasn't just expanding, it

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was doing so at an accelerating rate.

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This unexpected cosmic acceleration led

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scientists to revive the idea of a

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cosmological constant, but now, as an

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explanation for the mysterious dark energy

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driving this acceleration. For years,

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the simplest explanation has been that dark

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energy maintains a constant value throughout

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space and time. But DC's first year

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observations hint at something potentially

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revolutionary dark energy that changes over

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time. Andrew Hearin, a physicist at

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Argonne National Laboratory and DESE member,

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puts it in perspective. If the DECE result

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holds up, it means that a cosmological

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constant is not the origin of cosmic

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acceleration. It's much more exciting. It

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would mean that space is pervaded by a

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dynamically evolving fluid with negative

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gravity, which has never been observed in any

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tabletop experiment on Earth. To help

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investigate these potentially groundbreaking

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observations, research researchers at Argonne

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have turned to aurora, one of the world's

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most powerful exascale supercomputers.

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They're running enormous simulations that

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model how the universe evolves under

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different dark energy scenarios. The team

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created two massive simulations, one assuming

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constant dark energy, as Einstein's theory

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suggests, and another where it changes over

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time. Starting with identical initial

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conditions, they can track even the smallest

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differences that emerge as these virtual

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universes evolve. These

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simulations would have taken weeks of compute

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time on our earlier supercomputers, but each

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00:15:20.410 --> 00:15:22.930
simulation took just two days on Aurora,

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explained computational scientist Adrian

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00:15:25.050 --> 00:15:27.730
Pope. This dramatic speedup allows

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researchers to respond much faster to new

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cosmological observations. Gillian

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Belts Morman, a postdoctoral research fellow

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at Argonne, emphasized the value of these

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simulations. Since we can't create a, uh,

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mini universe to conduct experiments, we can

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test theories by using really big computers

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like Aurora to simulate the growth of

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00:15:47.770 --> 00:15:49.610
structure in the universe over time.

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While these simulations can't directly

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confirm dese's findings, they provide a

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crucial testing ground for examining

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different measurement techniques and

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00:15:59.010 --> 00:16:01.050
determining whether the patterns observed by

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DECE represent genuine new physics or

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00:16:04.090 --> 00:16:05.930
are uh, artifacts of how we collect and

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analyze data. To maximize the impact

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00:16:08.850 --> 00:16:11.520
of this work, the Argonne team has made all

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their simulation data publicly available,

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allowing the broader scientific community to

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explore different analysis methods and help

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00:16:19.080 --> 00:16:21.200
determine whether Einstein's cosmological

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00:16:21.200 --> 00:16:23.880
constant truly needs to be replaced with a

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00:16:23.880 --> 00:16:26.760
more dynamic model of dark energy. If

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confirmed, this finding would represent one

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00:16:29.440 --> 00:16:31.280
of the most significant shifts in our

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00:16:31.280 --> 00:16:33.560
understanding of the universe in decades,

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00:16:33.960 --> 00:16:36.560
potentially opening doorways to entirely new

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00:16:36.560 --> 00:16:39.100
physics beyond our current standard model of

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cosmology.

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That wraps up today's episode of Astronomy

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00:16:43.740 --> 00:16:46.540
Daily. What an incredible journey through our

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cosmic neighborhood we've had. From a Soviet

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00:16:48.940 --> 00:16:51.540
probe completing its 50 year orbit of Earth

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00:16:51.780 --> 00:16:54.500
to China's ambitious plans to sample Venus's

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00:16:54.500 --> 00:16:57.140
toxic atmosphere, the hunt for rogue planets

413
00:16:57.140 --> 00:16:59.820
wandering our galaxy, an ingenious satellite

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00:16:59.820 --> 00:17:02.020
rescue mission, and potentially revolutionary

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00:17:02.020 --> 00:17:04.020
discoveries about the very nature of dark

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00:17:04.020 --> 00:17:06.900
energy. I'm your host, Anna, and

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I want to thank you for joining me as, uh, we

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00:17:08.740 --> 00:17:10.700
explored these fascinating developments in

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space science and astronomy. The universe

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00:17:12.980 --> 00:17:15.380
continues to surprise us, challenging our

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00:17:15.380 --> 00:17:17.260
understanding and pushing the boundaries of

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00:17:17.260 --> 00:17:20.260
what we know. And before I go, a quick

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00:17:20.260 --> 00:17:22.300
reminder to visit our website at

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00:17:22.300 --> 00:17:24.940
astronomydaily IO um, where you can sign up

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00:17:24.940 --> 00:17:27.020
for our free daily newsletter and listen to

426
00:17:27.020 --> 00:17:29.580
all our back episodes we're

427
00:17:29.580 --> 00:17:31.220
constantly updating with the latest

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00:17:31.220 --> 00:17:32.940
astronomical discoveries and space

429
00:17:32.940 --> 00:17:34.640
explorations. Exploration news that you won't

430
00:17:34.640 --> 00:17:37.040
want to miss. Don't forget to subscribe to

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00:17:37.040 --> 00:17:39.880
the podcast on Apple Podcasts, Spotify,

432
00:17:40.440 --> 00:17:42.640
YouTubeMusic, or wherever you get your

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00:17:42.640 --> 00:17:44.920
podcast to stay connected to the cosmic

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00:17:44.920 --> 00:17:47.880
frontier. Until next time, keep looking Up

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00:17:59.420 --> 00:18:00.380
Is the soul

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00:18:02.850 --> 00:18:04.450
Mhm.