Oxygen in Distant Galaxies and Supernovae's Role in Extinction Events: S04E69

0:00 Speaker 1: Hello, and welcome to Astronomy Daily. I'm anna your cosmic

0:03 Speaker 1: companion as we explore the wonders of the universe together.

0:07 Speaker 1: Today's episode is packed with discoveries that remind us just

0:10 Speaker 1: how vast and mysterious our cosmos really is. From oxygen

0:14 Speaker 1: found in the most distant galaxy ever observed, to evidence

0:17 Speaker 1: suggesting supernovae may have triggered mass extinctions right here on Earth.

0:21 Speaker 1: We're covering the full spectrum of astronomical fascination, and that's

0:25 Speaker 1: just the beginning. We'll also explore revolutionary new telescope technology

0:30 Speaker 1: that could transform how we see the stars, examine an

0:33 Speaker 1: extraordinary nova explosion that outshines our Sun one hundred times over,

0:37 Speaker 1: and discuss Venus's current celestial positioning as it passes between

0:40 Speaker 1: Earth and our star. Plus, we'll delve into the theoretical

0:44 Speaker 1: realm with a fascinating new study on dice and swarms,

0:47 Speaker 1: those hypothetical megastructures that advanced civilizations might build around their stars,

0:52 Speaker 1: and the startling impact they could have on planetary environments.

0:56 Speaker 1: The universe continues to surprise us at every turn, challenging

1:00 Speaker 1: understanding and expanding our cosmic perspective. Whether you're a seasoned

1:04 Speaker 1: stargazer or just curious about what lies beyond our atmosphere,

1:08 Speaker 1: I promise you'll find something to marvel at in today's

1:11 Speaker 1: roundup of astronomical news. So get comfortable as we embark

1:14 Speaker 1: on this twenty five minute journey through the cosmos, exploring

1:18 Speaker 1: the latest breakthroughs, discoveries, and theoretical frontiers that are shaping

1:22 Speaker 1: our understanding of space, from the earliest moments of our

1:25 Speaker 1: universe to the potential future of advanced civilizations. We're covering

1:29 Speaker 1: it all on today's episode of Astronomy Daily. In a

1:33 Speaker 1: discovery that's pushing the boundaries of what we thought we

1:36 Speaker 1: knew about the early universe, astronomers have detected oxygen in

1:40 Speaker 1: the most distant galaxy ever observed. This isn't just any finding.

1:45 Speaker 1: It's the farthest detection of oxygen ever made by humanity,

1:49 Speaker 1: giving us a glimpse into cosmic conditions when the universe

1:52 Speaker 1: was just a cosmic toddler. The galaxy in question, designated

1:56 Speaker 1: with the rather unwieldy name JADESGSZ fourteen zero, was spotted

2:02 Speaker 1: by the James Webb Space Telescope earlier this year. What

2:05 Speaker 1: makes this discovery so remarkable is that the light from

2:09 Speaker 1: this galaxy has taken about thirteen point four billion years

2:12 Speaker 1: to reach us. That's a journey spanning ninety eight percent

2:15 Speaker 1: of our universe's one three dot eight dash billion dash

2:19 Speaker 1: year lifetime. But here's where things get really interesting. This

2:23 Speaker 1: ancient galaxy contains about ten times the amount of heavy

2:27 Speaker 1: elements that scientists would expect to find in a galaxy

2:30 Speaker 1: existing just three hundred million years after the Big Bang.

2:34 Speaker 1: As researcher Sanderskoes from Leiden Observatory put it, it is

2:38 Speaker 1: like finding an adolescent where you would only expect babies.

2:42 Speaker 1: To understand why astronomers are so excited, we need to

2:44 Speaker 1: consider what the infant universe was supposed to look like.

2:48 Speaker 1: In those early cosmic days, the universe was primarily filled

2:51 Speaker 1: with hydrogen and helium, the lightest elements. Heavier elements, which

2:55 Speaker 1: astronomers somewhat confusingly call metals, were extremely rare. These heavier

3:01 Speaker 1: elements are forged inside stars and scattered through space when

3:06 Speaker 1: those stars die in supernova explosions. This process then enriches

3:11 Speaker 1: gas clouds that form the next generation of stars. It's

3:15 Speaker 1: essentially a cosmic recycling program that becomes more efficient over time,

3:21 Speaker 1: so finding a galaxy so metal rich this early in

3:23 Speaker 1: cosmic history suggests that Jade's gsz fourteen zero matured much

3:29 Speaker 1: faster than our models predicted. This discovery is forcing astronomers

3:33 Speaker 1: to reconsider their understanding of how quickly galaxies can form

3:36 Speaker 1: and evolve in the early universe. The chemical analysis of

3:40 Speaker 1: this distant galaxy was made possible through a collaboration between

3:44 Speaker 1: the James Web Space Telescope and the Atacama Large Millimeter

3:48 Speaker 1: Submillimeter Array, or ALMA for short. While Web discovered the galaxy,

3:53 Speaker 1: alma's measurements allowed astronomers to determine its chemical composition with

3:57 Speaker 1: astonishing precision. Stefanocarneani of the Scuola Normale Superiori in Italy

4:04 Speaker 1: expressed his astonishment at these unexpected results, noting that they

4:08 Speaker 1: opened a new view on the first phases of galaxy evolution.

4:12 Speaker 1: The evidence that a galaxy is already mature in what

4:15 Speaker 1: we considered the infant universe raises profound questions about when

4:18 Speaker 1: and how galaxies formed. Perhaps even more impressive is the

4:22 Speaker 1: precision of alma's measurements. According to researcher Eleonora Parlanti, ALMA

4:28 Speaker 1: provided an extraordinarily precise measurement of the galaxy's distance, down

4:32 Speaker 1: to an uncertainty of just zero point zero zero five percent.

4:36 Speaker 1: To put that in perspective, that's like measuring a distance

4:39 Speaker 1: of one kilometer with an accuracy of just five centimeters.

4:43 Speaker 1: This discovery highlights the incredible synergy between our newest space telescope,

4:48 Speaker 1: James Webb, and ground based observatories like ALMA. Together, they're

4:52 Speaker 1: giving us an unprecedented look at the earliest chapters of

4:55 Speaker 1: our universe's story, revealing that cosmic evolution may have proceeded

5:00 Speaker 1: much faster than we previously thought. As astronomer Richard Bowens noted,

5:05 Speaker 1: this finding showcases the amazing synergy between ALMA and JWST

5:10 Speaker 1: to reveal the formation and evolution of the first galaxies.

5:14 Speaker 1: It seems that with each new observation, we're rewriting the

5:17 Speaker 1: timeline of cosmic history. Next up today, did you know

5:22 Speaker 1: that the dinosaurs might have been wiped out by cosmic fireworks.

5:26 Speaker 1: While an asteroid impact has long been the leading theory

5:29 Speaker 1: for their extinction, new research suggests that explosive supernova deaths

5:33 Speaker 1: of nearby massive stars may have played a significant role

5:36 Speaker 1: in triggering at least two major extinction events in Earth's

5:39 Speaker 1: distant past. A team of astronomers has discovered that supernovae

5:44 Speaker 1: occurring within sixty light years of Earth could have had

5:47 Speaker 1: catastrophic consequences for life on our planet. These stellar explosions

5:52 Speaker 1: represent some of the most energetic phenomena in the universe,

5:56 Speaker 1: and their proximity to Earth could have stripped our planet's

5:59 Speaker 1: atmosphere of its protective ozone layer. Without this crucial defense,

6:04 Speaker 1: life on Earth would have been exposed to damaging ultraviolet

6:07 Speaker 1: radiation from the Sun. As study co author Nick Wright

6:10 Speaker 1: from Keele University put it, a slightly more distant supernova

6:14 Speaker 1: could still cause considerable loss of life, but at this

6:17 Speaker 1: distance it would be terrifying. Right In, his colleagues conducted

6:22 Speaker 1: what amounts to a virtual census of our cosmic neighborhood.

6:26 Speaker 1: Using data from the now retired Guaya satellite. They examined

6:29 Speaker 1: more than twenty four thousand of the most luminous stars

6:32 Speaker 1: within about three thousand, two hundred and sixty light years

6:35 Speaker 1: of the Sun. Their goal was to identify groups of

6:38 Speaker 1: young massive stars and reconstruct the history of star formation

6:42 Speaker 1: near our solar system. What's particularly striking is that when

6:46 Speaker 1: the team calculated the rate of nearby supernova, they found

6:50 Speaker 1: it matched up remarkably well with the timing of unexplained

6:54 Speaker 1: mass extinction events on Earth. Two events in particular stood out,

6:58 Speaker 1: the Late Devonian extinction of about three hundred seventy two million

7:01 Speaker 1: years ago, which wiped out seventy five percent of all species,

7:06 Speaker 1: particularly affecting fish in ancient seas and lakes, and the

7:10 Speaker 1: Ordovician extinction from four hundred forty five million years ago,

7:14 Speaker 1: which eliminated roughly eighty five percent of marine species. It

7:18 Speaker 1: surprised me that the two rates were so similar, which

7:21 Speaker 1: made us want to highlight it. Wright noted previous research

7:24 Speaker 1: has already found evidence supporting cosmic influence on Earth's history.

7:28 Speaker 1: Scientists have detected radioactive isotopes like iron sixty in Antarctic

7:33 Speaker 1: snow and on the Moon's surface, materials that could only

7:36 Speaker 1: have come from interstellar sources like supernova. These findings have

7:40 Speaker 1: been linked to the depletion of Earth's ozone layer caused

7:43 Speaker 1: by cosmic rays showered onto our planet when stars exploded.

7:47 Speaker 1: The new study simulations showed that approximately one to two

7:50 Speaker 1: supernova occur each century in galaxies like our Milky Way.

7:55 Speaker 1: More critically, within that dangerous sixty light year radius of Earth,

7:58 Speaker 1: the rate works out to about two to two point

8:00 Speaker 1: five supernova per billion years. This estimate aligns remarkably well

8:05 Speaker 1: with the number of unexplained mass extinction events on Earth,

8:09 Speaker 1: specifically the Devonian and Ordovician extinctions, both of which occurred

8:13 Speaker 1: within the last billion years. While the researchers are careful

8:16 Speaker 1: to note that they don't have definitive proof these extinctions

8:20 Speaker 1: were caused by supernova, the matching rates make it a

8:23 Speaker 1: compelling possibility. As Alexis Quintana, who led the study, put it,

8:27 Speaker 1: these findings are a great illustration for how massive stars

8:31 Speaker 1: can act as both creators and destructors of life. Supernova

8:35 Speaker 1: explosions distribute heavy chemical elements throughout space, essential building blocks

8:40 Speaker 1: for new stars and planets. But if a planet like

8:43 Speaker 1: Earth happens to be too close when these cosmic bombs detonate,

8:46 Speaker 1: the consequences can be devastating. So the next time you

8:50 Speaker 1: gaze up at the night sky, remember that those twinkling

8:53 Speaker 1: stars might hold both the secrets to life's beginnings and

8:56 Speaker 1: potentially the power to dramatically alter its course here on Earth.

9:01 Speaker 1: Next let's take a look at a subject we don't

9:03 Speaker 1: visit too often, but this id truly fascinating. In what

9:07 Speaker 1: could be a revolutionary breakthrough for astronomy, engineers and astronomers

9:12 Speaker 1: at the University of Utah have designed an innovative new

9:15 Speaker 1: type of telescope lens that might forever change how we

9:18 Speaker 1: observe the cosmos. Unlike traditional bulky lenses and mirrors, this

9:22 Speaker 1: new technology is remarkably thin, a flat lens with microscopic

9:26 Speaker 1: etchings that refract light in precisely controlled ways. The most

9:30 Speaker 1: striking feature of this lens is its incredible thinness. Measuring

9:35 Speaker 1: less than a millimeter thick, it's practically a wafer compared

9:38 Speaker 1: to conventional telescope optics. Yet despite its slim profile, the

9:43 Speaker 1: lens performs remarkably well in initial tests, suggesting it could

9:47 Speaker 1: eventually replace the heavier, bulkier components typically used in astronomical telescopes.

9:53 Speaker 1: Our computational techniques suggested we could design multi level, diffractive

9:57 Speaker 1: flat lenses with large apertures that could focus light across

10:01 Speaker 1: the visible spectrum, explained Rajesh Mennin, a professor of engineering

10:05 Speaker 1: at Utah who worked on the project. The technology behind

10:09 Speaker 1: this breakthrough is fascinating. The team used a technique called

10:12 Speaker 1: grayscale optical lithography, a variation of methods typically used for

10:17 Speaker 1: etching electronics onto silicon wafers, to create microscopic concentric rings

10:22 Speaker 1: on a glass substrate. Most of the half millimeter thickness

10:25 Speaker 1: is actually just the glass itself, while the ringed grooves

10:29 Speaker 1: that do all the optical work are incredibly shallow at

10:32 Speaker 1: just two point four microns deep. While the concept of

10:36 Speaker 1: using concentric rings in flat lenses isn't entirely new, this

10:40 Speaker 1: multi level difractive lens, or MDL solves one of the

10:43 Speaker 1: biggest challenges in optics, chromatic aberration. This problem occurs when

10:48 Speaker 1: different wavelengths of light focus at different points, causing color

10:52 Speaker 1: fringing around objects. The Utah team's design cleverly brings all

10:57 Speaker 1: wavelengths from four hundred to eight hundred nanom covering the

11:01 Speaker 1: entire visible spectrum and into near infrared, to focus at

11:05 Speaker 1: exactly the same point. The weight difference is dramatic. Their

11:08 Speaker 1: one hundred mm prototype lens, with a focal length of

11:11 Speaker 1: two hundred mmm, weighs just twenty five grams compared to

11:14 Speaker 1: the two hundred and eleven grams of a similarly sized

11:17 Speaker 1: commercial lens that's seventeen mm thick at its center. That's

11:21 Speaker 1: more than an eighty eight percent reduction in weight. To

11:25 Speaker 1: demonstrate its capabilities, the team tested the lens by imaging

11:28 Speaker 1: both the Sun and the Moon, successfully revealing sunspots and

11:32 Speaker 1: accurate geological features on the lunar surface. This real world

11:36 Speaker 1: performance validation suggests the technology is viable for practical astronomical applications.

11:42 Speaker 1: The implications for space telescopes could be particularly transformative. Consider

11:47 Speaker 1: that the Hubble Space telescopes two point four meter primary

11:50 Speaker 1: mirror weighs a whopping one eight hundred and twenty five pounds,

11:54 Speaker 1: while the James Web Space telescopes segmented twenty one foot

11:57 Speaker 1: mirror weighs one thousand, five hundred fifty five pound. The

12:01 Speaker 1: tremendous mass of these components significantly drives up launch costs

12:04 Speaker 1: and engineering complexity. On Earth, the largest individual telescope mirrors

12:10 Speaker 1: currently max out at around twenty six to thirty three

12:12 Speaker 1: feet before gravity causes them to sag under their own weight.

12:17 Speaker 1: A flat, lightweight alternative could potentially break through these limitations,

12:21 Speaker 1: enabling even larger light gathering surfaces, both in space and

12:25 Speaker 1: on the ground. Our demonstration is a stepping stone towards

12:29 Speaker 1: creating very large aperture, lightweight flat lenses with the capability

12:33 Speaker 1: of capturing full color images for use in air and

12:36 Speaker 1: space based telescopes, said Apridim Majumder, who led the team

12:40 Speaker 1: behind the prototype. While the current prototype is modest at

12:44 Speaker 1: four inches in diameter, the breakthrough proves the concept is viable.

12:48 Speaker 1: If successfully scaled up, these lenses could potentially transform not

12:53 Speaker 1: just professional observatories, but eventually make their way into amateur

12:57 Speaker 1: telescopes as well, making advanced astronomic imaging more accessible to everyone.

13:03 Speaker 1: In a stellar discovery that's illuminating our understanding of cosmic explosions,

13:07 Speaker 1: astronomers have conducted the first ever near infrared study of

13:12 Speaker 1: a recurrent nova beyond our Milky Way galaxy. This extraordinary nova,

13:17 Speaker 1: designated LMCN one thousand, nine hundred sixty eight twelve A

13:22 Speaker 1: or LMC sixty eight, resides in the large Magellanic Cloud

13:26 Speaker 1: and has been revealing some truly shocking characteristics. Nova explosions

13:31 Speaker 1: occur in binary star systems, where a white dwarf a

13:34 Speaker 1: dense stellar remnant about the size of Earth, but with

13:37 Speaker 1: a mass comparable to our Sun pulls material from its

13:40 Speaker 1: companion star. This stolen material accumulates on the white dwarf's

13:43 Speaker 1: surface until it triggers a thermonuclear explosion. While most novas

13:47 Speaker 1: have been observed erupting just once, LMC sixty eight belongs

13:50 Speaker 1: to the rare category of recurrent novas, with explosions occurring

13:54 Speaker 1: with remarkable regularity. Every four years, a hot white dwarf

13:58 Speaker 1: star siphons off material from its cool companion star, explained

14:02 Speaker 1: astronomer Nia Evans of Keele University. The material piles up

14:06 Speaker 1: on the white dwarf's surface and eventually detonates in a

14:09 Speaker 1: thermonuclear runaway. Once the explosion has subsided, the siphoning starts

14:13 Speaker 1: all over, and in time another thermonuclear explosion occurs. What

14:19 Speaker 1: makes LMC sixty eight particularly special is that it was

14:22 Speaker 1: the first recurrent nova ever observed outside our galaxy. First

14:26 Speaker 1: spotted in nineteen sixty eight and again in nineteen ninety,

14:29 Speaker 1: it has maintained its four year eruption cycle with clockwork precision.

14:34 Speaker 1: After its twenty twenty eruption, NASA's Neil Garrel's Swift Observatory

14:39 Speaker 1: had been closely monitoring it anticipating the next explosion, which

14:43 Speaker 1: arrived on schedule in August twenty twenty four. The latest

14:47 Speaker 1: observations have revealed something truly extraordinary. During its eruption phase,

14:52 Speaker 1: this nova shines at nearly one hundred times the brightness

14:55 Speaker 1: of our Sun, making it an exceptionally powerful cosmic event.

15:00 Speaker 1: By analyzing the nova's near infrared light, astronomers gained unprecedented

15:05 Speaker 1: insights into its ultra hot phase. Using spectroscopy to examine

15:09 Speaker 1: the different wavelengths of light, they identified chemical elements present

15:13 Speaker 1: in the explosion and discovered unexpectedly intense signals from silicon

15:17 Speaker 1: atoms that had been ionized nine times, a process requiring

15:21 Speaker 1: enormous energy. The ionized silicon shining at almost one hundred

15:26 Speaker 1: times brighter than the sun is unprecedented, noted Tom gabal

15:30 Speaker 1: no Ar, lab Emeritus astronomer. And while this signal is shocking,

15:35 Speaker 1: it's also shocking what's not there. We would have expected

15:38 Speaker 1: to also see signatures of highly energized sulfur, phosphorus, calcium,

15:42 Speaker 1: and aluminum. This absence of expected chemical signatures points to

15:46 Speaker 1: something unusual happening with LMC sixty eight. The astronomers believe

15:51 Speaker 1: the answer might lie in two factors, exceptionally high temperatures

15:55 Speaker 1: and the star's location in the metal deficient environment of

15:59 Speaker 1: the large Magellana Cloud. The coronal temperature of LMC sixty

16:03 Speaker 1: eight reaches a blistering five point four million degrees fahrenheit

16:07 Speaker 1: that's three million degrees celsius, far hotter than typical novas.

16:11 Speaker 1: At these extreme temperatures, atoms undergo collisional ionization, where fast

16:15 Speaker 1: moving electrons strip atoms of more electrons than usual, pushing

16:19 Speaker 1: them into higher energy states. Additionally, since the nova's companion

16:24 Speaker 1: star likely has lower metallicity fewer heavy elements typical of

16:29 Speaker 1: the large Magellanic Cloud, this could lead to more powerful

16:32 Speaker 1: explosions as more material is needed to trigger the eruption.

16:36 Speaker 1: What makes these recurrent novas particularly intriguing is their potential

16:41 Speaker 1: connection to supernovas. As Evans explains, in systems like LMC

16:46 Speaker 1: sixty eight, less mass is ejected in the nova explosion

16:49 Speaker 1: than is gained by transferring from the cool star. This

16:53 Speaker 1: means that the mass of the white dwarf is steadily increasing.

16:57 Speaker 1: In time, it will approach a critical value above whis

17:00 Speaker 1: which the white dwarf cannot support its own weight, and

17:02 Speaker 1: it will implode, potentially triggering a supernova explosion. By expanding

17:08 Speaker 1: their observations beyond our galaxy and using the largest telescopes available,

17:13 Speaker 1: astronomers hope to increase their understanding of these fascinating cosmic

17:17 Speaker 1: explosions and how their behavior varies in different chemical environments

17:21 Speaker 1: throughout the universe. This weekend, Venus will reach what astronomers

17:26 Speaker 1: call an inferior conjunction, the moment when it passes directly

17:30 Speaker 1: between Earth and the Sun. This alignment happens approximately every

17:35 Speaker 1: nineteen months as a result of the orbital dance between

17:38 Speaker 1: Venus and our planet around the Sun. The precise moment

17:41 Speaker 1: of conjunction is expected around nine pm Eastern daylight time

17:45 Speaker 1: on Saturday. Despite being one of the most significant regular

17:48 Speaker 1: alignments in our solar system, this celestial event won't be

17:52 Speaker 1: much of a visual spectacle for casual observers. The glare

17:56 Speaker 1: from the Sun makes it really, really difficult to see

18:00 Speaker 1: Saness Michelle Nichols from Chicago's Adler Planetarium. Those hoping to

18:04 Speaker 1: catch a glimpse would need specialized equipment and considerable expertise

18:07 Speaker 1: to spot Venus against the overwhelming brightness of the Sun.

18:11 Speaker 1: Some astronomers have given this phenomenon a rather poetic nickname.

18:15 Speaker 1: Some people call that a Venus kiss, because we're extremely

18:18 Speaker 1: close together, says astronomer Gary Albright from James Madison University,

18:22 Speaker 1: describing the momentary alignment of our two planets. Like our moon,

18:27 Speaker 1: Venus goes through phases as it orbits the Sun. Just

18:30 Speaker 1: before and after conjunction, Venus appears as an extremely thin

18:34 Speaker 1: crescent when viewed through telescopes. For those interested in tracking

18:38 Speaker 1: this transition, the most noticeable change will be Venus's shift

18:42 Speaker 1: from the evening to the morning sky. In the days

18:45 Speaker 1: leading up to conjunction, Venus has been visible as one

18:48 Speaker 1: of the brightest objects in the evening sky, appearing near

18:52 Speaker 1: the western horizon shortly after sunset. After conjunction, early risers

18:57 Speaker 1: will have the opportunity to spot it in the eastern

18:59 Speaker 1: sky just before sunrise. However, observers should take extreme caution

19:04 Speaker 1: never to stare directly at the Sun when looking for Venus.

19:07 Speaker 1: While this weekend's alignment might not provide dramatic visuals for

19:10 Speaker 1: most of us, scientists value these predictable cosmic events as

19:14 Speaker 1: opportunities to track the movements of planets and refine our

19:17 Speaker 1: understanding of celestial mechanics. Get a chance to get to

19:21 Speaker 1: know Venus encourages Nichols, suggesting that even seemingly routine astronomical

19:26 Speaker 1: events offer valuable learning opportunities. The inferior conjunction has cultural

19:31 Speaker 1: significance beyond pure astronomy. Paul McCartney's song The Kiss of

19:35 Speaker 1: Venus was partly inspired by a book chapter describing this

19:39 Speaker 1: very phenomenon, showing how celestial events continue to influence art

19:42 Speaker 1: and music. Looking ahead, Venus will remain a focus of

19:46 Speaker 1: scientific interest. NASA has two upcoming missions planned to investigate

19:50 Speaker 1: our planetary neighbor in greater detail. These missions aim to

19:53 Speaker 1: reveal more about how Venus formed and why it evolves

19:56 Speaker 1: so differently from Earth, despite their similar sizes and ps

20:00 Speaker 1: positions in the Solar System. As Venus transitions from being

20:03 Speaker 1: an evening star to a morning star after conjunction, it

20:07 Speaker 1: provides a reminder of the constant clockwork motion of our

20:10 Speaker 1: Solar system, a celestial time piece that has fascinated humanity

20:14 Speaker 1: throughout history and to finish things today, a warning. As

20:19 Speaker 1: our energy needs grow alongside our technological capabilities, scientists are

20:23 Speaker 1: starting to consider what truly advanced civilizations might require for

20:27 Speaker 1: power generation. A fascinating new study published in Science Direct

20:31 Speaker 1: explores one of the most ambitious concepts in theoretical astro engineering,

20:35 Speaker 1: the dice and swarm, and its potential environmental consequences for

20:39 Speaker 1: planets like Earth. Originally proposed by physicist Freeman Dyson in

20:43 Speaker 1: nineteen sixty, a dis in swarm would consist of countless

20:46 Speaker 1: satellites or habitats orbiting a star to capture and utilize

20:50 Speaker 1: its energy output. Unlike the solid shell often depicted in

20:54 Speaker 1: science fiction, a swarm represents a more practical approach, allowing

20:58 Speaker 1: for incremental construction as a civilization's energy demands increase. The

21:03 Speaker 1: research conducted by Ian Marius Peters from the Helmholtz Institute

21:07 Speaker 1: erlangan Nernberg for Renewable Energy examines whether such a megastructure

21:11 Speaker 1: could be built using materials available in our solar system

21:14 Speaker 1: while preserving Earth's habitability. The findings are both remarkable and concerning.

21:20 Speaker 1: According to Peter's calculations, a complete dice and swarm surrounding

21:24 Speaker 1: our Sun would dramatically alter Earth's climate. If positioned outside

21:28 Speaker 1: Earth's orbit, such a structure would raise our planet's temperature

21:32 Speaker 1: by a staggering one hundred and forty degrees kelvin, rendering

21:35 Speaker 1: Earth completely uninhabitable. Smaller structures positioned inside Earth's orbit prove

21:40 Speaker 1: equally problematic, either becoming too hot for their own efficiency

21:44 Speaker 1: or blocking too much solar energy from reaching our planet.

21:48 Speaker 1: The study does propose a potential compromise, a partial structure

21:52 Speaker 1: positioned at about two point one to three astronomical units

21:55 Speaker 1: from the Sun. This configuration could harvest approximately four percent

21:59 Speaker 1: of the Sun's total energy output and astonishing fifteen point

22:03 Speaker 1: six yatawatts of power, while increasing Earth's temperature by less

22:07 Speaker 1: than three degrees kelvin. However, even this more modest design

22:11 Speaker 1: would represent an engineering challenge of unprecedented scale, requiring approximately

22:16 Speaker 1: one point three x ten twenty three kilograms of silicon,

22:20 Speaker 1: an amount that stretches the limits of what might be

22:22 Speaker 1: available in our solar system. If constructed, such a megastructure

22:26 Speaker 1: would elevate humanity to a Type two civilization on the

22:30 Speaker 1: Kardashev scale, a classification system that measures technological advancement based

22:36 Speaker 1: on energy consumption. Currently, we haven't even achieved Type one status,

22:40 Speaker 1: which would require harnessing all available energy reaching Earth from

22:44 Speaker 1: the Sun. While purely theoretical at this stage, the concept

22:47 Speaker 1: of dice and swarms highlights the delicate balance between technological

22:51 Speaker 1: advancement and environmental preservation as we look toward a future

22:55 Speaker 1: of increasing energy demands, particularly if we hope to venture

22:57 Speaker 1: beyond our solar system. These calculations provide a sobering reminder

23:01 Speaker 1: that even the most ambitious engineering projects must consider their

23:05 Speaker 1: impact on the very worlds they aim to benefit. Well.

23:10 Speaker 1: That brings us to the end of another fascinating journey

23:13 Speaker 1: through our cosmic neighborhood. From distant galaxies with unexpected oxygen

23:17 Speaker 1: levels to nova explosions outshining our Sun, and from revolutionary

23:22 Speaker 1: telescope technology to the potential environmental impacts of theoretical megastructures,

23:28 Speaker 1: the universe continues to surprise and inspire us with its

23:32 Speaker 1: endless wonders. As we've seen today, astronomy isn't just about

23:36 Speaker 1: distant stars and galaxies. It directly connects to life here

23:40 Speaker 1: on Earth, whether through ancient supernovae potentially triggering mass extinctions,

23:46 Speaker 1: or the engineering challenges that might shape our species future.

23:50 Speaker 1: The cosmos and our home planet are intimately linked in

23:53 Speaker 1: ways we're only beginning to understand. I hope you've enjoyed

23:57 Speaker 1: this episode of Astronomy Daily. I'm anna an. It's been

24:00 Speaker 1: my pleasure to share these astronomical discoveries with you today.

24:04 Speaker 1: If you're hungry for more space and astronomy content, I

24:07 Speaker 1: invite you to visit our website at Astronomy Daily dot io,

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24:17 Speaker 1: While you're there, browse are constantly updating news feed to

24:20 Speaker 1: catch up on all the latest developments we couldn't fit

24:23 Speaker 1: into today's episode, and explore our archive of past episodes.

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24:49 Speaker 1: Astronomy Daily. Until next time, keep looking up. The universe

24:53 Speaker 1: is an amazing place and we're just beginning to understand

24:56 Speaker 1: its secrets. His bit star is bt Star is the