WEBVTT

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Anna: Hello, everyone, and welcome to Astronomy

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Daily. I'm your host, Anna, and I'm thrilled

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to have you join us for another journey

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through the cosmos. Here we dive into the

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latest, most fascinating discoveries and

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events shaping our understanding of the

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universe. Uh, all delivered with a friendly,

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accessible approach. Today, we'll start by

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exploring the largest black hole merger ever

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detected, an event so immense it's

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challenging our current theories. Then we'll

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look at how private spaceflights are not just

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reaching orbit, but also paving the way for a

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dynamic commercial space economy. Plus,

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we'll uncover the secrets of an ancient lunar

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meteorite that's rewriting the Moon's

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volcanic history. And finally, we'll discuss

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a rare opportunity to own a piece of the Red

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Planet. But you will need deep pockets. Stay

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tuned.

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Let's kick things off with a truly massive

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cosmic event. Astronomers have recently

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detected the largest black hole merger ever

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observed, an incredible event that has

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resulted in a new black hole approximately

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225 times the mass of our Sun.

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This monumental collision, officially named

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GW 231123, was picked

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up by the LIGO gravitational wave

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observatories. Now, you might be wondering,

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what exactly are gravitational waves? These

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are ripples in the very fabric of spacetime,

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first theorized by Albert Einstein in his

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General Theory of Relativity. They're caused

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by the most violent and energetic events in

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the cosmos, like the merging of two massive

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black holes. The first direct detection of

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these waves happened back in 2015 at the US

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Laser Interferometer Gravitational Wave

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Observatory, or LIGO, marking a

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groundbreaking moment in astrophysics. Since

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then, gravitational wave observatories have

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truly opened a new window to the universe,

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detecting hundreds of black hole mergers. The

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LVK Network of Detectors, which is a

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collaboration between ligo, the Virgo

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detector in Italy and KAGRA in Japan, has

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alone spotted about 300 such events in just

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the last 10 years. The newest and

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largest discovery, GW23

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1123, was detected on

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November 23, 2023.

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Scientists poring over the data have

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determined that this event involved the

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collision of two individual black holes, each

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incredibly massive, ranging from 100

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to 140 times the size of our Sun.

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To give you some perspective, the previous

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record holder for a black hole merger, known

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as GW190521,

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involved black holes with a combined mass of

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140 times that of the Sun. So this new

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detection is a significant leap. The findings

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and their implications are being presented at

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major international conferences, highlighting

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just how important this discovery is. Mark

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Hannam, a member of the LVK

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collaboration from Cardiff University in

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Wales notes that this is the most

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massive black hole binary we've observed

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through gravitational waves, and it presents

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a real challenge to our understanding of

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black hole formation. He explains that black

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holes of this immense size are not easily

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accounted for by standard stellar evolution

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models. One exciting possibility is that

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these colossal black holes actually

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formed through earlier sequential mergers

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of smaller black holes. Imagine a

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cosmic game of billiards. But with black

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holes, gravitational wave observations

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like GW 231123 are incredibly

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valuable because they allow astronomers to

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observe phenomena that truly test the limits

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of known physics. Charlie Hoy,

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another LVK member from the UK's University

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of Portsmouth, points out that the black

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holes appear to be spinning very rapidly,

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near the limit allowed by Einstein's theory

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of general relativity. This rapid spin makes

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the signal incredibly complex and difficult

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to model and interpret, serving as an

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excellent case study for pushing forward the

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development of theoretical tools. The

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scientific community recognizes that

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unraveling this intricate signal will take

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time. Gregorio Carullo from the University of

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Birmingham, uk, suggests it will take years

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for the community to fully unravel this

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intricate signal pattern and all its

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implications. While a black hole

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merger remains the most likely explanation,

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he hints that more complex scenarios could be

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the key to deciphering its unexpected

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features. Ultimately, as Dave

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Reitze, the Executive Director of ligo, puts

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it, this observation once again demonstrates

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how gravitational waves are uniquely

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revealing the fundamental and exotic nature

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of black holes throughout the universe.

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It's truly a thrilling time to be studying

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the cosmos, moving from the

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distant cosmos to our orbital neighborhood.

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We have a quick wrap up to our coverage of

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the private AX4 mission to the International

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Space Station. AXIOM Mission 4, the

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fourth NASA supported private astronaut

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mission, has successfully completed its

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flight. This endeavor is a crucial part of

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NASA's strategy to to foster a vibrant low

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Earth orbit economy and build operational

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knowledge for future commercial space

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stations. The four person crew

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safely returned to Earth, splashing down off

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the coast of California aboard a SpaceX

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Dragon spacecraft. The international team

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included Peggy Whitson from Axiom Space,

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Shubhanshu Shukla from the Indian Space

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Research Organization, Slawosz Uznanski

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Wisniewski of Poland and Tibor Kapu from

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Hungary. They spent about two and a half

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weeks in space, having launched on June 25

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from NASA's Kennedy Space center and

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undocking on July 14. During

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their time on the ISS, the crew conducted

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approximately 60 science experiments along

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with educational outreach and commercial

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activities, returning valuable research,

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including NASA cargo, back to Earth.

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This mission truly highlighted global

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collaboration. It fulfilled a commitment by

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President Trump and Indian Prime Minister

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Narendra Modi to send the first ISRO

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astronaut to the station, involving five

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joint science investigations. It also

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carried the first astronauts from Poland and

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Hungary to stay aboard the space station.

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This successful private flight demonstrates

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NASA's vision for a strong economy off

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Earth. By purchasing services from commercial

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providers, NASA can meet its size, science

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and research objectives in microgravity more

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efficiently and at a lower cost. This

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strategic shift enables the agency to

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dedicate more resources and focus on its

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ambitious Artemis missions to the moon in

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preparation for Mars, while low Earth orbit

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continues to serve as an essential training

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ground for these deep space explorations.

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Now let's turn our attention closer to home,

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to our celestial neighbor, the Moon. A

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remarkable discovery is rewriting what we

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thought we knew about its fiery past A rare

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lunar meteorite found in Africa in

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2023 is shedding new light on hidden

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volcanic processes that shaped the moon long

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after its surface was believed to have

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cooled. This meteorite, officially

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named Northwest Africa 16286,

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is an incredible 2.35 billion years

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old. Its unique chemical signature has

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plummeted a significant gap in our

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understanding of the moon's volcanic history.

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Researchers from the University of Manchester

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unveiled their fascinating results at the

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Goldschmidt conference in Prague, detailing

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how this ancient rock illuminates the moon's

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evolving interior and the surprising

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longevity of its volcanic activity.

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By carefully measuring lead isotopes, the

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team determined that this particular rock

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star solidified around 2.35 billion years

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ago. This period is especially

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interesting because we have almost no other

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samples from that specific time. What makes

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it even more extraordinary is its unusual

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geochemical fingerprint, which sets it apart

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from the basalts brought back by the Apollo,

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Luna, and Chang' E missions. This

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suggests it crystallized from deep source

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lava shortly after reaching the lunar

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surface. Dr. Joshua Snape, a

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research fellow at the University of

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Manchester, explained the immense scientific

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value of lunar meteorites. While samples

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from return missions are invaluable, they are

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limited to the immediate landing sites. Lunar

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meteorites, however, can be ejected by impact

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cratering from anywhere on the moon's

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surface, offering a serendipitous glimpse

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into areas we couldn't otherwise explore

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without the massive expense of a space

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mission. This 311 gram

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meteorite is a type of lunar volcanic basalt

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called olivine ferric basalt, containing

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relatively large crystals of the mineral

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olivine, along with moderate levels of

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titanium and high levels of potassium. Beyond

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its unusual age, the study found that its

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lead isotope composition, a geochemical

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Fingerprint points to an origin in the Moon's

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interior with an unusually high uranium to

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lead ratio. These chemical clues suggest

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ongoing heat generation within the Moon,

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likely from radiogenic elements decaying and

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producing heat over an extended period. The

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age of the sample is particularly exciting

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because it effectively bridges an almost

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billion year gap in lunar volcanic history.

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It's younger than the basalts collected by

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the Apollo, Luna and Chang' e 6 missions,

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but older than the much younger rocks

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retrieved by China's Chang' E5 mission.

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Its composition, combined with its age,

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indicates that volcanic activity continued on

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the Moon throughout this vast timespan. This

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unique rock provides new constraints about

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when and how volcanic activity occurred on

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the Moon, guiding where future sample return

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missions might land. From ancient

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Moon rocks, we now travel even further to

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another familiar neighbor, Mars.

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Soon, a unique opportunity will allow someone

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here on Earth to own a significant piece of

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the red planet. As A.H. sotheby's prepares to

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auction off the largest known Martian

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meteorite on our world. This extraordinary

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Specimen, officially designated NWA

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16788, is anticipated to

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fetch up to $4 million at the upcoming

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auction in New York City. The rarity of such

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a find cannot be overstated. Out of more than

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77,000 officially recognized meteorites

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discovered on Earth, only about 400, or

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roughly 0.6%, originate from Mars.

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NWA 16788 itself, uh,

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represents an impressive 6.5% of all

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Martian material currently known on our

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planet. This colossal chunk of Martian rock,

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weighing in at just over 54 pounds, was

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likely dislodged from Mars by an asteroid

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strike, sending it on an incredible journey.

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It traveled an astounding 140 million miles

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through space before making its dramatic

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landing in the Zaharov-Reutt Desert, where it

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was discovered in Niger's remote agadez

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region in 2023. Cassandra

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Hatton, Sotheby's vice chairman of Science

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and Natural History, highlighted the sheer

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improbability of this journey, stating that

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the odds of this getting from there to here

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are astronomically small. More than just

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a collector's item,

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NWA6788 is believed to be

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a relative newcomer to Earth, having fallen

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from outer space quite recently. This means

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it offers a pristine window into the Martian

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past. Hatton emphasizes its scientific

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significance, calling it not just a

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miraculous find, but a massive data set that

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can help us unlock the secrets of our

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neighbor, the Red Planet. Specimens like

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this from the Moon and Mars are considered

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among the greatest rarities on our planet,

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with Sotheby's noting that all known bits of

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both could fit into the cargo hold of a large

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suv. It truly is a chance to hold a piece

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of another world in your hands.

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And to wrap up today, some late breaking news

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from Australia's Gilmore Space. They've just

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posted the following message on we've

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scrubbed our July 16th launch window. Now

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targeting the next approved opportunity July

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27th. Why? Ops delayed us a day

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and current upper wind forecasts have ruled

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out a safe launch for the rest of the week.

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Team will be back for the 27th of July, and

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that brings us to the end of another

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fascinating journey through the cosmos here

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on Astronomy Daily. Today, we've explored

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some truly incredible stories from the

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largest black hole merger ever detected,

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GW 231123, which is

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pushing the limits of our understanding of

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these cosmic giants to the successful return

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of The Axiom Mission 4 crew, showcasing

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the exciting future of commercial space

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travel and international collaboration on the

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International Space Station. We also delved

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into the mysteries of a 2.35 billion

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year old lunar meteorite found in Africa,

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which is rewriting the volcanic history of

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our Moon. And finally, we looked at the

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incredible opportunity to own a piece of the

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Red Planet with The auction of NWA

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16788, the largest Martian

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meteorite on Earth. Thank you for tuning in

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and joining me, Anna on Astronomy Daily. If

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you want to dive deeper into these stories,

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sign up for our free daily newsletter or

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catch up on all our back episodes, visit our

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website at astronomydaily IO.

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You can also subscribe to the podcast on

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Apple Podcasts, Spotify, YouTube Music, or

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wherever you get your podcasts, so you never

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miss an episode. Until next time, keep

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looking up