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Anna: Welcome to Astronomy Daily, your regular

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dose of the latest and greatest from across

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the cosmos.

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Avery: We're your hosts, Avery and Anna, and we've

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got some truly fascinating stories from the

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world of space and astronomy for you today.

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Anna: We'll be starting by remembering a true

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legend of space exploration. Astronaut

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James Lovell, whose incredible life and

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contributions left an indelible mark on

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humanity's journey to the stars. Then we'll

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shift our gaze to the night sky, discussing

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the upcoming Perseid meteor shower and

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whether the bright moon might put a damper on

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this year's viewing party. But don't worry,

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we'll have some tips for you after

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that. We're off to explore a groundbreaking

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discovery by the Hubble Space Telescope,

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which has revealed evidence of a rare white

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dwarf collision, shedding new light on steel

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stellar evolution.

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Avery: And finally, we'll launch into a truly

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ambitious concept, the potential for space

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travel to a nearby black hole within the next

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century, exploring the technology and the

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scientific implications of such a monumental

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journey.

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Anna: So get ready for an exciting tour of

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the universe.

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We begin our show today with some somber news

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from the world of space exploration. We're

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reflecting on the remarkable life of

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astronaut James Lovell, who sadly passed

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away recently at the age of.

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Lovell was a true icon, a member of

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humanity's first trip to the moon and

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famously the commander of NASA's challenging

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Apollo 13 mission.

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Avery: That's right, Ana. NASA announced his passing

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and acting administrator Sean Duffy released

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a statement saying, NASA sends its

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condolences to the family of Captain Jim

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Lovell, whose life and work inspired millions

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of people across the decades. Jim's character

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and steadfast courage helped our nation reach

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the moon and turned a potential tragedy into

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a success from which we learned an enormous

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amount. We mourn his passing even as we

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celebrate his achievements. It really speaks

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volumes about the man he was.

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Anna: Absolutely. He was a four time

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Gemini and Apollo astronaut. But he's

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perhaps most famously known for his portrayal

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in the 1995 feature film

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Apollo 13. Tom Hanks played him

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and Lovell himself had a great sense of humor

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about it, often joking at public appearances.

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I know today when I came out, many of you

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were expecting Tom Hanks, but you're going to

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have to settle for little old me.

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Avery: Such a humble man. His career was truly

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groundbreaking. He was selected with NASA's

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second group of astronauts in 1962

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and first launched aboard Gemini 7 in

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December 1965. This was a

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pivotal mission as it was the first to

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include a rendezvous with another crewed

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spacecraft, Gemini 6. And he and

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Commander Borman spent two weeks in Earth

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orbit, setting the US record for the

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longest spaceflight at the time, all in

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preparation for the later Apollo missions.

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Anna: And he was a key figure in demonstrating the

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skills needed for lunar missions. He

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commanded Gemini 12, the program's final

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flight, where his crewmate Buzz Aldrin,

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conducted the first truly successful

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spacewalks, showing that astronauts could

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effectively work outside a, uh, spacecraft.

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This was a huge step forward for the program,

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indeed.

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Avery: Then came his first trip to the moon as part

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of Apollo 8 in December 1968.

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This mission was revolutionary, marking the

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first time humans had flown to another

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celestial body. Lovell, Bolt Borman and

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William Bill Anders were the first to see the

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far side of the moon with their own eyes and

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captured the iconic Earthrise photographs,

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which many credit with inspiring the

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environmental movement. Lovell himself said,

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you had to pinch yourself, hey, we're really

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going to the moon. This is it. It

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truly was a high point. As Lovell himself

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later reflected, that mission brought a much

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needed uplift to the American people during

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the turbulent year when a telegram sent to

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the crew stating, you saved

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1968. But of course, the

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mission that cemented his legend was Apollo

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13 in April 1970. What was

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intended to be NASA's third moon landing

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quickly turned into a fight for survival

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after an explosion tore through the

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spacecraft's service module. That's when his

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famous line, houston, we've had a problem

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here came into play. He saw gas escaping

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from the spacecraft and oxygen gauges

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dropping to zero, and it was a dire

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situation. But his calm leadership, along

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with crewmates Fred Haise and Jack Swigert,

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guided them through incredible challenges to

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a safe splashdown. It was a testament to his

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courage and ingenuity, turning a potential

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tragedy into an incredible story of human

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perseverance.

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Anna: He was already a record breaker even before

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Apollo 13, being the first person to launch

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into space four times. After

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his active flight career, Lovell continued to

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contribute, serving as Deputy Director of

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Science and Applications at what's now

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Johnson Space center before retiring from

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NASA and the Navy. He then moved into the

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business world, holding executive roles and

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serving on various boards.

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Avery: And his contributions were recognized with

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numerous accolades, including the

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Congressional Space Medal of Honor and the

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Presidential Medal of Freedom. He was

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inducted into the International Space hall of

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Fame, the US Astronaut hall of Fame, and the

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National Aviation hall of Fame. A crater

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on the far side of the moon was even named

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for him in 1970.

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Anna: His legacy extends beyond his professional

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achievements. His family released, uh, a

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statement saying they were enormously proud

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of his amazing life and career

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accomplishments highlighted by his legendary

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leadership in pioneering human spaceflight.

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But to all of us, he was dad,

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granddad, and the leader of our family.

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Most importantly, he was our hero. We

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will miss his unshakeable optimism,

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his sense of humor, and the way he made each

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of us feel we could do the impossible. He

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was truly one of a kind.

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Avery: What a beautiful tribute. With James Lovell's

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passing, only five of the 24 people who flew

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to the moon during the Apollo program remain

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Livin's. His contributions to space

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exploration and his unwavering spirit will

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undoubtedly continue to inspire generations

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to come. He truly embodied the adventurous

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and resilient spirit of human spaceflight.

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Anna: From a somber reflection, we now turn our

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gaze to a more regular yet still exciting

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celestial event, the annual Perseid

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meteor shower. August is often dubbed

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meteor month for observers in the Northern

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hemisphere, largely thanks to this

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display.

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Avery: That's right, Anna. It's beloved by everyone

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from serious meteor enthusiasts to casual

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summer campers. However, for 2025,

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skywatchers need to be aware of a significant

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obstaclethe Moon.

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Anna: Unfortunately, this year the moon will turn

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full on August 9th and will be in a very

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bright, waning gibbous phase a few nights

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later, right when the Perseid peak is

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predicted to occur. And that's for the

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overnight hours of Monday, August 11th

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into the pre dawn hours of Tuesday, August

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12th. Awaiting gibbous is just about the

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worst moon phase for meteor observing.

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Avery: It truly is. The moon will be 89%

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illuminated and will be flooding the sky with

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light through most of that keen night. This

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will definitely hamper any serious attempts

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to observe the meteors. It's a bit of a redux

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of 1968 when the moon was in the same phase

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during the Perseid peak. Back then, a meteor

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watch in Central park only saw a about one

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meteor every minute or eight, when

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typically you'd expect one every minute or

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two.

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Anna: So quantity over quality then, because

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moonlight only hides the fainter meteors.

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Many Perseids are known to be fast, bright

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and often leave persistent trains.

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These brighter, streaky Perseids can

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definitely burn right through a moonlit sky,

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exactly as.

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Avery: Uh, Guy Adewell notes in his Astronomical

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Calendar 2025. Perseid meteors

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are swift, many are bright. 1 White, yellow,

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green, red, orange, leave spectacular

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long lasting trains and end in flares. And

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occasionally you get an outstandingly bright

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Perseid fireball that blazes forth impressive

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enough to attract attention even with bright

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moonlight. So if you're willing to sacrifice

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the sheer number of meteors, you might still

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catch some truly spectacular ones.

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Anna: The best time to watch, as always,

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is from 11pm or midnight

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straight on until the first light of dawn.

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10 the meteors can appear anywhere in the

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sky, so just make sure you're watching in a

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direction where the Moon isn't directly in

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your eyes.

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Avery: It's definitely not the ideal year, as a

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single observer in the absence of moonlight

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might see 45 to 90 meteors per hour.

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We won't come close to that in 2025,

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but for those already thinking ahead,

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2026 promises a much better show,

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with the peak night coinciding with a new

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Moon and even a solar eclipse. The so while

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this year is challenging, next year will be a

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different story. In the meantime, keep an eye

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out for a few celestial streakers and don't

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forget the eye catching conjunction of

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Jupiter and Venus. Low in the east northeast

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sky a few hours before sunrise. It's a nice

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constellation prize for the Moonlit Perseids

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of 2025.

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Anna: From looking at our own skies, let's now

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pivot to a truly fascinating discovery

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made possible by the venerable Hubble Space

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Telescope. It has uncovered compelling

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evidence of a rare white dwarf merger,

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shedding new light on stellar evolution and

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the ultimate fates of binary stars.

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Avery: This is a significant finding. Scientists at

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the University of Warwick detected carbon in

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the ultra massive white dwarf known as

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WD0525526,

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which is located about 130 light years away.

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In optical light, it looks like an ordinary

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hydrogen rich white dwarf, but Hubble's

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ultraviolet spectra revealed something much

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more unique.

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Anna: That faint carbon trace in its atmosphere is

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the telltale sign that this object is the

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product of a rare white dwarf merger rather

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than just a single star's evolution. What's

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even more remarkable is that the detected

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carbon is four to five orders of

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magnitude lower than in previously known

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merger remnants, making this the earliest

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stage example of such a merger found so far.

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Avery: It really highlights the power of ultraviolet

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observation. Normally, ultramassive white

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dwarfs hide their carbon beneath thick

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hydrogen and helium envelopes, but in

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WD0525526

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these layers are 10 billion times

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thinner. This thinning likely resulted from

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two stars merging and burning off their outer

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layers during the cosmic collision. The

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leaving behind a stripped remnant with a

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nearly pure hydrogen atmosphere, yet

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with carbon still leaking through.

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Anna: And the mechanism behind this carbon leakage

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is also quite intriguing. At nearly four

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times the sun's surface temperature,

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WD0525526

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is too hot for typical convection to bring up

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carbon. Instead, the team identified

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semiconvection, a subtle mixing Process

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never before seen in white dwarfs that allows

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a modest amount of carbon to drift upward.

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This opens a new chapter in stellar physics.

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Avery: The discovery challenges previous assumptions

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that hydrogen rich white dwarfs lack carbon.

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It implies that low level carbon pollution

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might be hidden beneath thin atmospheres in

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many ultramassive white dwarfs, only

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detectable with sensitive ultraviolet data.

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Anna: This research deepens our understanding of

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cooling delays in what's called the Q branch

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of the Gaia hertzsprung Russell diagram,

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which is linked to core crystallization.

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It also ref binary merger rates and

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helps us better identify potential

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progenitors of Thermonuclear Supernova

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WD0525526

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acts as a benchmark for models of stellar

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mergers and white dwarf evolution.

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Avery: It's incredible that Hubble, even at 35 years

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old, is still the only telescope capable of

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making such observations. The researchers

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stress the vital importance of planning for a

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new ultraviolet observatory to continue this

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work and survey more ultramassive white

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dwarfs across the galaxy, which could reveal

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a whole hidden population of these rare

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merger remnants.

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Anna: From uncovering hidden stellar secrets with

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Hubble, let's now set our sights on an even

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more ambitious concept. The idea of

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interstellar travel to a black hole.

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It sounds like something out of science

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fiction, but a new concept by astrophysicist

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Cosimo Bambi of Fudan University

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suggests a tiny laser propelled probe

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could actually make this trip to within a

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human lifetime.

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Avery: That's absolutely mind blowing. This

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vision, published in Eye Science, outlines

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how gram scale nanocrafts could journey to

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a nearby black hole and directly test the

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depths of gravitational physics. The first

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challenge, of course, is finding a hidden

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black hole. Close enough.

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Anna: Exactly. Known black holes like Jaia

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Baeshuan, uh, are over 1500 light years

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away. But Bambi estimates there might be 1

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within 20 to 25 light years. Based on

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stellar and white dwarf densities in galactic

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region. Detecting one would require new

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techniques such as microlensing or

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gravitational wave events, which could pick

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up the pull of an otherwise invisible object.

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Given rapid advances in these methods, Bambi

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argues we could locate a suitable target

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within 10 years.

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Avery: That's a much shorter timeline for finding

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one than I would have thought. The core of

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this incredible mission lies in those

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nanocrafts. They'd be space probes or

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weighing just a few grams, Essentially a

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silicon chip like wafer with a reflective

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light sail made from advanced metamaterials.

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A powerful laser array on Earth would

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push the sail, accelerating the craft to

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speeds approaching a third of the speed of

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light.

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Anna: And at that astonishing speed, a black hole

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20 to 25 light years away could be reached in

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about 60 to 75 years. Once the data

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is gathered, the signals would take another

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20 to 25 years to return, making the

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mission's full timeline around 8, 80 to 100

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years, potentially even shorter if higher

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speeds are achieved.

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Avery: This isn't just about the journey. It's about

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the extraordinary experiments they could

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conduct Near a black hole's extreme gravity.

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For instance, if two or more nanocrafts were

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used, One could orbit closer while another

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observes. The inner craft would beam, uh, a

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steady electromagnetic signal Back to its

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partner According to general relativity. The

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timing of that signal should match

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predictions of the Kerr metric, which

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describes spacetime Around a rotating black

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hole. Any deviations could reveal new

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gravitational physics.

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Anna: Another fascinating test involves approaching

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or even crossing an event horizon. If a

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nanocraft falls into a true black hole,

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Its signal should become increasingly

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redshifted until it vanishes from view. But

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if the object is a fuzzball with no horizon,

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the signal might disappear suddenly. Only a

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direct mission could truly reveal the truth.

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They could even test if fundamental

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constants, like the fine structure constant

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change under intense gravity.

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Avery: Despite the incredible scientific payoff,

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There are major hurdles. The laser

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infrastructure alone would cost an estimated

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1 trillion euros today. Though Bambi

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expects costs to drop significantly over the

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next two to three decades, Nanocraft

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technology, including durable light sails and

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miniaturized instruments, still needs

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development and communication across light

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years. Navigation and target precision are

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daunting.

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Anna: Yet as Bambi points out, Breakthroughs once

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deemed impossible, like detecting

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gravitational waves or imaging black hole

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shadows, are now realities. His

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goal is to spark a conversation that could

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launch a century long project,

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Potentially opening a direct window into

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gravity's most extreme realm.

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Avery: It's truly inspiring to think that future

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generations Might begin building and planning

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for such a mission. While today's scientists

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are laying the groundwork. This interstellar

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ambition could transform astrophysics,

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Allowing direct measurements of spacetime and

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extreme gravity that either reaffirm or

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challenge Einstein's theory.

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Anna: Well, that brings us to the end of another

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fascinating episode of Astronomy Daily. Thank

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you so much for joining us today.

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Avery: It's been quite a journey through the cosmos,

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hasn't it? We remembered the incredible

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legacy of astronaut James Lovell. We

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discussed the challenging Perseid meteor

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shower this year, and explored Hubble's

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amazing discovery Of a rare white dwarf

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collision.

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Anna: And of course, we dared to dream about the

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possibility of sending nanocrafts to a black

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hole within the next century. There's always

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so much happening in the universe.

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Avery: Indeed, there is. We hope you enjoy

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diving into these stories with us, and please

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visit our website at, uh, astronomydaily

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IO for more news and to listen to our back

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episodes.

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Anna: Join us next time for more celestial insights

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and the latest news from beyond our world.

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Until then, keep looking up