Astronomy and Planetary Science Thread

publiusr · 16 August 2024

Flyaway · 17 August 2024

Dinosaur-killing Chicxulub asteroid formed in Solar System’s outer reaches

The object that smashed into Earth and kick-started the extinction that wiped out almost all dinosaurs 66 million years ago was an asteroid that originally formed beyond the orbit of Jupiter, according to geochemical evidence from the impact site in Chicxulub, Mexico.

The findings, published on 15 August in Science1, suggest that the mass extinction was the result of a train of events that began during the birth of the Solar System. Scientists had long suspected that the Chicxulub impactor, as it is known, was an asteroid from the outer Solar System, and these observations bolster the case.

…

Fischer-Gödde’s team found that the ruthenium isotopes in the Chicxulub impactor were a good match for a carbonaceous asteroid from the outer Solar System, and did not match siliceous asteroids from the inner Solar System.

https://www.nature.com/articles/d41586-024-02647-4
Related paper:

https://www.science.org/doi/10.1126/science.adk4868

NMaude · 17 August 2024

Chixulub Impactor sounds like the name of an edgy hard rock band

.

publiusr · 17 August 2024

NMaude · 17 August 2024

publiusr said:
I thought KT was known by a layer of Iridium--a platinum group metal.

It is.

NMaude · 17 August 2024

Anton Petrov has this new video out concerning the "Handedness" of certain biologically important molecules and this no doubt has major implications for extra-terrestrial life:

Hello and welcome! My name is Anton and in this video, we will talk about new solutions to the mysteries of chirality of life
Links:
https://www.biorxiv.org/content/10.11...https://www.youtube.com/redirect?ev...ent/10.1101/2024.04.23.590732v2&v=UMJYVYX1VPg
https://en.wikipedia.org/wiki/Thalido...https://www.youtube.com/redirect?ev...ia.org/wiki/Thalidomide_scandal&v=UMJYVYX1VPg
Previous videos: • Major Breakthrough On Origins of Life...
https://www.youtube.com/watch?v=L1wkR-92Rys&t=0s
• Puzzle Solved! Cosmic Rays Caused DNA... https://www.youtube.com/watch?v=L1wkR-92Rys&t=0s
#chirality #originoflife #earth

0:00 Mystery of origins of life: chirality
1:35 Questions
2:08 Pasteur's discovery
2:40 Why this is important
4:55 New explanations - accidental discovery
6:15 Results from the study
7:50 Could membranes also be chiral though?
8:30 Conclusions

NMaude · 18 August 2024

A new video by Anton Petrov concerning a new ultra short period planet:

Hello and welcome! My name is Anton and in this video, we will talk about a discovery of a planet that may help us understand what happens to ice giants when they get close to stars
Links:
https://arxiv.org/abs/2407.21167 https://www.youtube.com/redirect?ev...ttps://arxiv.org/abs/2407.21167&v=idohfn-EceY
https://arxiv.org/abs/1803.03303 https://www.youtube.com/redirect?ev...ttps://arxiv.org/abs/1803.03303&v=idohfn-EceY
Previous videos:
• Did our Sun swallow a GIANT super Ear...
https://www.youtube.com/watch?v=HHfKj5I2_E8&t=0s
• Chthonian Planets - What/Why/How - Un... https://www.youtube.com/watch?v=HHfKj5I2_E8&t=0s

#chthonian #planet #astronomy

0:00 Weird planets called USPs
0:50 New unusual Earth like planet
2:30 Similar planets and how they relate to stars
3:30 Planetary properties and comparisons to Hot Jupiters
4:50 Differences and similarities
6:05 Types of stars containing these planets
6:50 Mini neptune remnants?
7:30 Conclusions

Flyaway · 19 August 2024

Possible natural explanation for the Wow signal based on new work done at Arecibo. He’ll be interviewing one of the people behind this new work later in the week. It involves large hydrogen clouds in the Galaxy, flares from Magnetars, and it’s important to remember, and this isn’t often covered that the signal was blue shifted, and that the signal was not actually at the hydrogen line but just above it.

View: https://youtu.be/YqI5HtDFL4I?si=K9msoU9uqanew8wo

Flyaway · 19 August 2024

Follow up interview with Professor Abel Mendez:

View: https://youtu.be/mCKuA8P9HOw?si=ABR7cvJnJIAvqxlM

Related paper:

https://arxiv.org/abs/2408.08513

Flyaway · 20 August 2024

New observations by the James Webb Space Telescope suggest that an icy moon around Uranus may have an underground liquid ocean.

https://www.forbes.com/sites/jamiec...ds-evidence-for-an-ocean-world-around-uranus/
Related paper:

https://iopscience.iop.org/article/10.3847/2041-8213/ad566a

Flyaway · 21 August 2024

Ancient ocean of magma found on Moon south pole

The Moon’s south pole was once covered in an ocean of liquid molten rock, according to scientists.

…

Remnants of the ocean were found by India’s historic Chandrayaan-3 mission that landed on the south pole last August.

https://www.bbc.com/news/articles/cx2n0jgldn5o

Flyaway · 21 August 2024

Researchers using Georgia State University’s Center for High Angular Resolution Astronomy (CHARA) Array have identified new details about the size and appearance of the North Star, also known as Polaris. The new research is published in The Astrophysical Journal.

…

The team successfully tracked the orbit of the close companion and measured changes in the size of the Cepheid as it pulsated. The orbital motion showed that Polaris has a mass five times larger than that of the Sun. The images of Polaris showed that it has a diameter 46 times the size of the Sun.

The biggest surprise was the appearance of Polaris in close-up images. The CHARA observations provided the first glimpse of what the surface of a Cepheid variable looks like.

https://news.gsu.edu/2024/08/20/new...w-view-of-north-star-reveals-spotted-surface/
Related paper:

https://iopscience.iop.org/article/10.3847/1538-4357/ad5e7a

Flyaway · 22 August 2024

Strange system as they’ve already found one hot Jupiter planet very close to the host star and now they have found a sub-Neptune planet even closer in. The two planets are in a nearly 2:1 resonance. They believe there may be a third planet further out in the system but they haven’t definitely discovered that one yet.

”Both TOI-1408 b and TOI-1408 c are incredibly close to their parent star compared to the planets in our solar system," research lead author Judith Korth of Lund University told Space.com. "Imagine our solar system, but instead, Jupiter is orbiting very close to the sun nearly every four days, one-twentieth of the period of Mercury.

"This is already very close to the star, and still, we detected another planet even closer to the star that interacts strongly with its big neighbor, causing their orbits to wobble in ways we've never seen before."

…

"The system’s dynamics are finely tuned, likely as a result of its formation history. The planets' orbits are near a 2:1 period ratio, meaning for every two orbits of TOI-1408c, TOI-1408b orbits the star once," Korth said. "This might help stabilize their orbits despite their proximity to each other and the star."

https://www.space.com/nasa-tess-super-earth-hot-jupiter-wobbly
Related paper:

https://arxiv.org/abs/2407.17798

Flyaway · 23 August 2024

Using the James Webb Space Telescope (JWST), an international team of astronomers has observed a nearby spiral galaxy known as NGC 891. Results of the observational campaign, published August 15 on the preprint server arXiv, provide more insights into the nature of this galaxy and its circumgalactic medium.

https://phys.org/news/2024-08-astronomers-explore-nature-galaxy-ngc.html
Related paper:

https://arxiv.org/abs/2408.08026

NMaude · 23 August 2024

Anton Petrov has a video about how the Higgs Boson should've destroyed the Universe:

On another note Astrum has a video out about something to Neptune's cloud:

NMaude · 24 August 2024

Astrum has put out this video about Voyager 1 and 2 and what they detected at the Solar System's boundaries:

publiusr · 24 August 2024

NMaude · 24 August 2024

Another video from Anton Petrov concerning Alpha Origins (Which appears to have eaten a lower mass companion star):

Hello and welcome! My name is Anton and in this video, we will talk about a new study on Betelgeuse that suggests it's a binary star

Links:
https://iopscience.iop.org/article/10...https://www.youtube.com/redirect?ev...iop.org/article/10.1086/3821232&v=2PYG_upOxUc
Betelgeuse videos: • Potential Evidence That Betelgeuse Ma...
https://www.youtube.com/watch?v=i4oBP-cqwCA&t=0s
• Major Updates About Supernova of the ...

• Betelgeuse Is Being Strange Again! Bu... https://www.youtube.com/watch?v=f2WPVThTklo&t=0s

#betelgeuse #supernova #astronomy

0:00 Betelgeuse, Betelgeuse, Betelgeuse
1:20 When will it go supernova?
2:20 Variable star and why it matters
3:05 LSP - Long Secondary Pulsations
4:40 What the longer cycle means for predicting the supernova
5:35 Two major propositions
6:10 Best explanation so far - a buddy
8:20 So what's going on here?
9:20 Conclusions and implications

NMaude · 25 August 2024

Here's an interesting geology video from Rachel aka GEO GIRL about how exploring Earth's geology would a useful primer for astrophysicists and astronomers for understanding extra-solar terrestrial planets:

0:00 Reason for video
2:32 How we study Earth’s past
3:42 Physical features in Earth rocks
6:31 Physical features in Mars rocks
8:23 Physical features on icy moon, Europa
14:30 Chemistry of Earth rocks
18:49 Chemistry of Enceladus & Titan rocks
22:09 Habitability vs origin of life events
23:40 Biology of Earth rocks
25:13 Possible biology of other planets & moons

References:
Sedimentary Structures video (and references therein): • The Ultimate Guide to Sedimentary Str... https://www.youtube.com/watch?v=fmQXGT2oUno&t=0s
Europa Geology video (and referernces therein)- • Is Europa Geologically Active?- Europ... https://www.youtube.com/watch?v=7UI4LKOuAOU&t=0s
Europa Interior video (and referernces therein)- • Europa's Core, Mantle, & Water Shell-... https://www.youtube.com/watch?v=dJ-biPZG8Jw&t=0s
Potential for Life on Enceladus video (and referernces therein)- • Probability of Life on Enceladus- The... https://www.youtube.com/watch?v=2WX_RAPFSSg&t=0s
Enceladus Analogs video (and referernces therein)- • How We Study Aliens from Earth & Dete...

NMaude · 25 August 2024

I just stumbled across this interesting Astrum video (Uploaded three months ago) about the ESA's BepiColombo mission to Mercury (It made its' third Mercury flyby in June 2023 and will be making its' fourth flyby on September 5, 2024):

What the BepiColombo space probe has discovered so far.

References :
Constructional volcanic edifices on Mercury - https://bit.ly/3wJD9lE https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbmM3bW5Sd0djb0c4aUZIaEtlZWlPd1MzRmtKd3xBQ3Jtc0tuSVlaTjFyc3ZDYVZlZHhpM1I0eUJqR1g2VzF5aHJlN0pkbmJLOHRaV0hyT3pQVk5GVzg3eDlvaVlXWFZpMVFWOTFQbFdPUGVWQTJDd2QwUDB5UXRYZmJPOUg0NXVlMUpWSHhBSWJPbTR3a2tycndUbw&q=https://bit.ly/3wJD9lE&v=t5tzbu_Hvts
The BepiColombo Planetary Magnetometer MPO-MAG: What Can We Learn from the Hermean Magnetic Field? - https://bit.ly/3V6MlKq https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbjVHcGpoSlNScGNER2VCVWpnMFdUbTNmZzdMUXxBQ3Jtc0trWUgzNF9jRU0yckRZNjVVZ25pYVJ5b3ZkQjNIRXR1U3AwcUxwZkpuQTA1cEhNYzBOcGhKN3FfbEg2NGxJNzd3dlNsUTRUMGQ1ZTlwcWJDUEs3S1haMVcydzNlcUUzcnl6ekk0blBkQVUzcFczNzFWOA&q=https://bit.ly/3V6MlKq&v=t5tzbu_Hvts

Images/Video:
Caloris Basin - https://go.nasa.gov/3V5GftA https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbVZvUG5VOVhDdUNpaWhiOFNkN19Ya1E0TnlDZ3xBQ3Jtc0trcFN4a1ZZOEZzV2szb1ZGUHBMQlFqUWNBeTdUZzlmb3NlLWMwam8tNkJPVDhrcmhfdENDenhWU1ZmVXhCWmhhaWJIaEo1bzNCWmYwR3I0Z1k2SUVBQXBZTllPZFBWVXlYUERqc3JwWl8yQVo3bVZTdw&q=https://go.nasa.gov/3V5GftA&v=t5tzbu_Hvts
BepiColombo’s second Mercury flyby - https://bit.ly/3ytn2t0 https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqazFQY0twZUxkRjNiYnJMQkFjRlBwYTdxeWVWZ3xBQ3Jtc0ttc0xYYXZFOV9Qd2N0VmMwajBJSlRYbnpUYmQ5Y1E4cVNDblBUWEJBdEhKZ040MnFDdW9ZektPcjdxOEFXWVNXdEVyZmQ2cHJzc3hoNU8zUFZGaHozenZ3RUlSTDhKS0FNVllxNTQ3YmNrQmtSb0hLcw&q=https://bit.ly/3ytn2t0&v=t5tzbu_Hvts
BepiColombo's first views of Mercury - https://bit.ly/3WVbadH https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbnpYSWZsQm1LQ3VTMF85a0FVYnVDRlhfbHV5Z3xBQ3Jtc0ttLVBRQ2t4MWlxWFVjOVE5YzhRVzVOeHl1OWlkMnVfNW85d0h0VXlRTHdvaUdkV3FGR0d5bTY0dUxLOVBzYzVST2ROb1Fwc2x2YWVmQ2RQc1ZtNkpWYmNsNkRsZHdQNW01WEtadGNYVzktQTUyTVl3RQ&q=https://bit.ly/3WVbadH&v=t5tzbu_Hvts
ESA - BepiColombo’s first tastes of Mercury science - https://bit.ly/3V9FwYz https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbmU4ck9MbkFwX2dPWXR1d0Q4bjVrcl81Nmc0d3xBQ3Jtc0tsYjNCRE40ekpldlVjZzVSX28zRnBJYjFna3BOczd2emctQmNPTGdMUU1ZSlhWZkstcVhVS1pBR2JvdG5FN1BYaS1nUlNHcXp1NkZ2NlZNNVJPTThFaHpKdTNvR2RraXlxQXdJbTVHYUJMalhrTzI2cw&q=https://bit.ly/3V9FwYz&v=t5tzbu_Hvts
ESA - A trio of images highlight BepiColombo’s third Mercury flyby - https://bit.ly/4bMSSPW

Edit: Here's the much longer Webinar that GEO GIRL abbreviated into her new video.

Title: Tracing Our Terrestrial Roots: A Roadmap to Discovering Extraterrestrial Life – 03-01-2024
Guest Speaker: Dr. Rachel Phillips, University of South Carolina.
Summary: In this talk, Dr. Phillips discusses how studying Earth’s past helps us search for alien life. It’s all about the rocks! Rocks preserve ‘proxies’ or physical, chemical, and biological signatures that help scientists reconstruct ancient climate and oceanic conditions. Studying the earth’s past helps us understand current climate trends and predict future ones. These same studies can help scientists understand the geological structure of planets like Mars.

Another example is for studying Europa, one of Jupiter’s moons, which has a liquid water ocean covered by ice crust. Europa has many tectonic features similar to features found on Earth. By studying the proxies in the rocks on these planets/moons, scientists can determine if there might be life there.
If you are interested in how scientists seek the conditions for life on planets and moons in our solar system, this video is for you! We hope you enjoy it

!iTelescope

iTelescope https://www.itelescope.net https://www.youtube.com/redirect?ev...A&q=https://www.itelescope.net/&v=IwgMlYXNmzQ
Dr. Phillips YouTube Channel / @geogirl https://www.youtube.com/@GEOGIRL
Dr. Phillips website https://www.geogirlscience.com https://www.youtube.com/redirect?ev...https://www.geogirlscience.com/&v=IwgMlYXNmzQ

Chapters
0:00 Introduction
2:29 Outline of Presentation
3:01 How we study Earth’s past
3:55 Proxy-based reconstruction
5:00 Three types of proxies: Physical, Chemical, Biological
5:23 Physical Proxies
14:07 Chemical Proxies
27:11 Poll question: Is methane on Enceladus biotic or abiotic?
32:00 Second poll question:
33:35 Biological Proxies
39:37 Questions and Answers

#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology

Flyaway · 26 August 2024

Webb Finds Early Galaxies Weren’t Too Big for Their Britches After All

When astronomers got their first glimpses of galaxies in the early universe from NASA’s James Webb Space Telescope, they were expecting to find galactic pipsqueaks, but instead they found what appeared to be a bevy of Olympic bodybuilders. Some galaxies appeared to have grown so massive, so quickly, that simulations couldn’t account for them. Some researchers suggested this meant that something might be wrong with the theory that explains what the universe is made of and how it has evolved since the big bang, known as the standard model of cosmology.

According to a new study in the Astronomical Journal led by University of Texas at Austin graduate student Katherine Chworowsky, some of those early galaxies are in fact much less massive than they first appeared. Black holes in some of these galaxies make them appear much brighter and bigger than they really are.

…

Although they’ve settled the main dilemma, a less thorny problem remains: There are still roughly twice as many massive galaxies in Webb’s data of the early universe than expected from the standard model. One possible reason might be that stars formed more quickly in the early universe than they do today.

“Maybe in the early universe, galaxies were better at turning gas into stars,” Chworowsky said.

https://science.nasa.gov/missions/w...-werent-too-big-for-their-britches-after-all/
Related paper:

https://iopscience.iop.org/article/10.3847/1538-3881/ad57c1

NMaude · 26 August 2024

Anton Petrov has just put out a video about several stars that have been tidally disrupted and eaten by by supermassive blackholes:

Hello and welcome! My name is Anton and in this video, we will talk about most unusual tidal disruption events discovered in the last few months
Links:
https://arxiv.org/abs/2405.10895 https://www.youtube.com/redirect?ev...ttps://arxiv.org/abs/2405.10895&v=iGwX-pVGE5s
https://arxiv.org/abs/2401.05490 https://www.youtube.com/redirect?ev...ttps://arxiv.org/abs/2401.05490&v=iGwX-pVGE5s
https://iopscience.iop.org/article/10...https://www.youtube.com/redirect?ev...rticle/10.3847/1538-4357/ad18bb&v=iGwX-pVGE5s

Previous videos:
https://www.youtube.com/watch?v=yKI1q8OkxVg&t=0s
• Tidal Disruption Event Updates: Stran...

• Major Updates About a Bizarre Explosi... https://www.youtube.com/watch?v=hpBT-yGEgm8&t=0s

0:00 TDE discoveries
1:00 How tidal disruptions usually happen
1:50 May 2024 discovery
2:30 Bright TDE very far away
3:20 Closest TDEs found
4:05 TDEs in other frequencies
4:25 Most powerful even so far
5:36 An unusual star and a rare event
6:40 Connection to extreme events
7:30 Conclusions

#tde #tidaldisruptionevent #scarybarbie

Flyaway · 27 August 2024

An international team of astronomers reports the discovery of a new hyperluminous quasar. The newfound quasar, which received the designation eFEDSJ0828–0139, has a high star-formation rate and its black hole is accreting mass at a super-Eddington rate. The discovery was detailed in a research paper published August 16 on the preprint server arXiv.

…

Summing up the findings, the authors of the paper noted that eFEDSJ0828−0139 is likely in a particular phase in which SMBH and its host galaxy are actively growing in the framework of galaxy-SMBH co-evolution.

"We may be witnessing the growing phase of both SMBH and its host galaxy in the course of the galaxy–SMBH coevolution, as expected by the numerical simulation," the researchers concluded.

https://phys.org/news/2024-08-hyperluminous-quasar.html
Related paper:

https://arxiv.org/abs/2408.08498

Flyaway · 27 August 2024

In the quest to understand the universe’s many mysteries, astronomers are looking for potentially trillions of elusive space objects called rogue worlds. These stellar objects blur the lines between planet and star–to better understand the cosmic processes that form both.

A team of astronomers using the James Webb Space Telescope (JWST) recently spotted six new rogue worlds in a young nebula. The findings are detailed in a study published August 27 in The Astronomical Journal and indicate that rogue worlds may help create celestial objects that are even bigger than the planet Jupiter. These newly discovered worlds may even be gas giants 5 to 10 times bigger than our solar system’s biggest planet.

https://www.popsci.com/science/new-rogue-worlds/
The link to the related paper in the article doesn’t work.

NMaude · 27 August 2024

Anton Petrov has a new video out concerning the origin of the Chixulub-impactor that caused the KT-extinction event ending the Cretaceous period:

Hello and welcome! My name is Anton and in this video, we will talk about the asteroid that killed the dinosaurs once again

Links:
https://www.science.org/doi/10.1126/s...https://www.youtube.com/redirect?ev...org/doi/10.1126/science.adk4868&v=9A_jOMVFTpw
https://www.science.org/doi/10.1126/s...https://www.youtube.com/redirect?ev....org/doi/10.1126/sciadv.adp0114&v=9A_jOMVFTpw
Previous videos:
https://www.youtube.com/watch?v=gw5ZHPWRUOg&t=0s
• What Really Happened on The Day Dinos...

• Evidence Shows We Don't Really Know W...

• Unexpected Discovery of Another Crate...

• Wow, Dinosaur DNA Remnants May Have B...

• Where Exactly Did the Dinosaur Killin...

• Ripples From Megatsunami That Killed ... https://www.youtube.com/watch?v=TrGNYkIYio0&t=0s

0:00 K-Pg event and dinosaurs
1:40 Exact time when this event most likely happened
2:40 Bird DNA and evolution
3:20 Where this asteroid came from - new study
4:00 How this study was conducted - ruthenium
5:10 C-type asteroids and their origins
7:10 Definitive evidence
7:35 Why this matters - water
8:15 How likely will this happen again?
9:00 Largest dangerous asteroid right now
10:40 Conclusions

NMaude · 27 August 2024

Here's an interesting what if video about visiting Kepler-22b:

Welcome to Kepler-22 b. Chase: Hey y'all! I've got an exciting mission. To land on and explore a planet that could easily be Earth 2.0. Exoplanets are like the planets inside our Solar System, but they orbit different stars. It's cool, but there's only one problem. Exoplanets are far away. So your Solar System is this little neighborhood of planets and moons with the Sun in its center. And light-years away from this neighborhood, there are potentially billions of others. What If guy got tired of sending me to die in the Solar System. This time, I'm travelling to an exoplanet where I might actually have a chance to survive.

Interestingly enough Ripley Scott's cancelled SF TV-series Raised by Wolves was set on Kepler-22b.

Flyaway · 28 August 2024

The LUX-ZEPLIN, or LZ, experiment has searched for and ruled out the existence of dark matter particles with a wide swath of properties, researchers report August 26 at two conferences. Dark matter is a substance whose influence can be seen on the scale of galaxies and galaxy clusters, but which has never been directly detected.

LZ searches for a hypothetical type of dark matter particle called a weakly interacting massive particle, specifically WIMPs with masses above 9 billion electron volts. (For comparison, a proton has a mass of around 1 billion electron volts). The LZ detector, filled with 10 metric tons of liquid xenon, monitors for atomic nuclei recoiling when WIMPs plow into the liquid (SN: 7/7/22).

https://www.sciencenews.org/article/dark-matter-wimps-lz
Related papers:

https://indico.uchicago.edu/event/427/contributions/1325/
https://indico.cern.ch/event/1390649/contributions/6061507/

FighterJock · 28 August 2024

So that is WIMPs out of the equation to be a candidate for Dark Matter, though there is another possibility of Dark Stars, so called because scientists think that they are made up of Dark Matter. And if they are then the Universe must be full of Dark Stars.

Michel Van · 28 August 2024

This here is speculative Exobiology

View: https://www.youtube.com/watch?v=0hcI7FxP0fc&t=82s

NMaude · 28 August 2024

Some major Moon updates from Anton Petrov:

Hello and welcome! My name is Anton and in this video, we will talk about new discoveries coming from the Moon

Previous Moon videos:
https://www.youtube.com/watch?v=zCMf35iO0Z0&t=0s
• Lunar Crater That Formed a Quasi Moon...
• Moon Mission Updates! Japanese Missio...

• Major Moon Updates: Rock Anomaly, Wei... https://www.youtube.com/watch?v=siIPmpQJia4&t=0s
#moon #nasa #space

0:00 Moon updates! And a new time zone?
2:00 Mystery of Lunar atmosphere possibly solved
4:25 Lunar swirly mystery - what are these?
6:05 Possibly solution for the magnetic anomaly
8:00 Best colony location!
9:05 Scanning the lunar caves and the new Chinese missions
11:05 Graphene found too
12:00 Conclusions

Brett Davidson · 28 August 2024

An exploration of the recent discovery of a new deep ocean source for dark oxygen production and how that may play into a new potential solution to the Fermi Paradox.

TL;DW - Manganese nodules produce 'dark oxygen' useful to complex deep sea life. There's no reason why nodules wouldn't be common in ice moons throughout the galaxy, if they aren't under a thick layer of high-pressure ice. This could allow the evolution of complex life in such moons. However, they can't develop metals-based technological civilisations, because if they did, they're deprive themselves of oxygen (and die). Also, it's not likely they'd even be aware of the universe beyond their ice shells.

View: https://www.youtube.com/watch?v=0hcI7FxP0fc

EDIT, since Michael Van's posted this, let's add some more to make it worthwhile.

Interesting but on the wider speculation in the later part of the video, I'm sceptical of any argument that relies on one factor and specifically, I don't think that metals are the only possible basis for technology. I call it the rice pudding fallacy: rice pudding is certainly a 'signature' of life and civilisation on earth and if we found it elsewhere, we could reasonably suppose that a civilisation had made it. However, rice pudding is not a sole and essential requirement for life and there are substitute foods that are as good or even better (and certainly more interesting). Yet again, we're back to the problem of 'signatures.' Just what are simple molecules signatures of? There's far too much anthropomorphism in SETI and astrobiology as a whole in my opinion.

'Assembly theory' might provide a way out of this conundrum.

https://www.nature.com/articles/s41467-021-23258-x
https://www.quantamagazine.org/a-new-theory-for-the-assembly-of-life-in-the-universe-20230504/

The focus here is looking for molecules that can be produced through complex lifelike processes.

https://www.nature.com/articles/s41586-023-06600-9
AT, objects are not considered as point particles, but instead are defined by the set of possible histories of their formation as an intrinsic property. Defined in this way, we show how objects themselves can provide measurable evidence of selection, whether within the well-defined boundary of an individual or selected unit, or not.

NMaude · 28 August 2024

Rhinocrates said:
View: https://www.youtube.com/watch?v=0hcI7FxP0fc

Michael Van has already posted that video a couple of posts upthread

.

Brett Davidson · 28 August 2024

NMaude said:
Michael Van has already posted that video a couple of posts upthread.

Aha, so he did!

I decided to edit and add some more.

Flyaway · 29 August 2024

A mysterious ring of radio light could have been created by a type of massive star with a powerful wind of radiation blowing away its outer layers, according to astronomers who made the discovery with the MeerKAT radio telescope in South Africa.

https://www.space.com/odd-radio-circles-meerkat-observatory-star-losing-layers
Related paper linked to at end of the article.

Flyaway · 29 August 2024

JWST discovers New Planet - it’s the coldest, oldest exoplanet ever imaged:

View: https://youtu.be/oJYWOWylZ94?si=x85-lYS8I6hjVVqs

Flyaway · 29 August 2024

C/2023 A3 (Tsuchinshan-ATLAS)

A Dazzling Comet is Heading Our Way! It Will Outshine Brightest Stars

Aug 28, 2024
A dazzling comet is headed our way and it will most certainly outshine even the brightest stars in the night sky. The comet is named C/2023 A3 (Tsuchinshan-ATLAS). It was discovered in early 2023 when it was a billion km away, between the orbits of Jupiter and Saturn.

This comet has the potential to become the next great comet, a term used to describe comets that are so exceptionally bright that they capture the attention of even casual observers who aren't actively looking for them. These comets often become widely recognized outside of the astronomical community, making headlines and sparking public interest. The last comets to earn this title were Hale-Bopp in 1997 and McNaught in 2007, both of which put on spectacular displays.

View: https://youtu.be/z9SLAokDS_4

NMaude · 30 August 2024

Anton Petrov has a video out about a galaxy sterilising quasar:

Hello and welcome! My name is Anton and in this video, we will talk about a strange quasar that killed all galaxies near it (VIK J2348-3054)

Links:
https://www.aanda.org/component/artic...https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbEVmR0RjZ1NzRHFhLWJ2dElURWJ1QmR1T1hZZ3xBQ3Jtc0tsQkZFUHk0Zy1fTWNrbmNQWjBqY1NyS21ob2s1czRhcXdhUzNWTG45c0E3emw4NkdRZzNrel90UDlDeVEtUHBPTnJmOXFJaU1Va1c2X0RBUXpPanNLMDkxS3lrajRjb0RoZ0F2Ym9tV01SWjBTblZtOA&q=https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/202449566&v=uVgYWlgfisk
https://iopscience.iop.org/article/10...https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbC1tOEp0R2RhVHB0Ui1MWTZmRGhucWZseFFVZ3xBQ3Jtc0tsNElIRTNyanhGZHlKLXdqckk1dTZlMlBvUWZRYW5palhSUldSOVFWb0djVTJjLVYtOExyeUYtb2ZLb3JmOGN4dlFjcG1JODVKZFJUNEtzWXd6S2xRQWkwa1hTVFM4VV9LdnVHckRtUFAxdEhPSVpsOA&q=https://iopscience.iop.org/article/10.3847/2041-8213/ad35c7&v=uVgYWlgfisk
https://iopscience.iop.org/article/10...https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbnRTb0d3WWFsQUdVY0NKdHZhSmN0bnI2NXRXUXxBQ3Jtc0tuUEJxQ2hoZHN0clZfZEdnMWxlSFJwcVdWX2FfOVFWSUtHWlpaZVJtLUlpZ0dyRG8xYkh4Y1Ftd0hUSWdKSk5qdHdJeXVCdWJaOGtFRFliYmJJYVJmT040VEh5RldPZ0tIRnlYckYxOWlmRC1WNFVZOA&q=https://iopscience.iop.org/article/10.3847/1538-4357/ad429e&v=uVgYWlgfisk

#quasar #universe #astronomy

0:00 Quasar updates
0:28 First ever quasar collision
1:35 Clarification about quasars
2:10 Quasar gas and galactic wind extremes
3:40 Effects
4:05 Insane quasar found that killed all galaxies around itself
6:55 Did something happen to Milky Way and M87?
7:50 Conclusions

Flyaway · 30 August 2024

Cool Worlds - Do ‘Grabby Aliens’ solve the Fermi Paradox?

He explains why he doesn’t buy this particular theory. He did send his criticisms of the theory to the person who originated the video before making the video, and discussed it with them.

View: https://youtu.be/tR1HTNtcYw0?si=O9afou6z9Owl_S6-

NMaude · 31 August 2024

Astrographics has a rather interesting video about intergalactic supervoids:

Explore the universe’s vast cosmic voids, where nothingness defies cosmic laws. Dive deep into the mysteries of these immense empty spaces and uncover the secrets they hold.

Flyaway · 1 September 2024

NASA spacecraft collision may have created a meteor shower that will last for 100 years

Rocky debris blasted away from the tiny asteroid Dimorphos when NASA’s DART spacecraft intentionally slammed into it in 2022 could create the first human-made meteor shower known as the Dimorphids, new study has found.

https://edition.cnn.com/2024/08/31/science/dimorphos-dart-impact-debris-meteor-shower/index.html
Related paper:

https://arxiv.org/abs/2408.02836

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