Astronomy and Planetary Science Thread

[NMaude]

Anton Petrov has a video out about a 38 mile wide asteroid that evidence indicates it impacted Earth 3.2 billion years ago:

Hello and welcome! My name is Anton and in this video, we will talk about a giant impact 3.2 billion years ago that turned Earth into hell, but life still survived
Links:
https://www.pnas.org/doi/10.1073/pnas...https://www.youtube.com/redirect?ev...org/doi/10.1073/pnas.2408721121&v=XGR_TlGpZVI
Impacts: • Important Details Emerge About The Or...
https://www.youtube.com/watch?v=aKAcT2X9lkU&t=0s
• Evidence For The Biggest Impact Crate...

• The Day Dinosaurs Died - 2nd Asteroid...

• Evidence Shows Huge Impacts Created C... https://www.youtube.com/watch?v=5TKvT8iNwyE&t=0s

#s2impact #earth #extinction

0:00 Early impacts on Earth
0:40 Signs of frequent impacts
1:30 How did this affect Earth?
2:40 New study - huge s2 impact
3:45 Effects from this event and how we know this
5:20 Not just survival but proliferation of life
6:30 Blooming biosphere
8:10 How did life survive though?
9:30 Signs of new metabolism and evolution
10:15 Conclusions and implications

 

[NMaude]

Simon Whistler from Astrographics has a fun video concerning Hypernovae:

Discover the explosive power of hypernovas, the universe's most catastrophic star deaths. Explore how these rare, intense cosmic events outshine galaxies and shape the universe in unimaginable ways.

 

[Flyaway]

First young brown dwarfs found outside the Milky Way?

An international team of astronomers has used the NASA/ESA/CSA James Webb Space Telescope to detect the first brown dwarf candidates outside the Milky Way in the star cluster NGC 602.

First young brown dwarfs found outside the Milky Way?

An international team of astronomers has used the NASA/ESA/CSA James Webb Space Telescope to detect the first brown dwarf candidates outside the Milky Way in the star cluster NGC 602.

www.esa.int

 

[FighterJock]

I wonder how many brown dwarfs are actually in the observable universe? I think that we have only touched the tip of the iceberg.

 

[NMaude]

I wonder how many brown dwarfs are actually in the observable universe? I think that we have only touched the tip of the iceberg.

At least as many, if not more, as there are red-dwarf stars.

 

[Rhinocrates]

Every alternate month, a techbro reinvents phrenology or the bus. Every alternate month an astronomer finds that planets around red dwarfs may or may not be habitable.

Rocky planets orbiting small stars could have stable atmospheres needed to support life

A new study finds that rocky planets orbiting small stars do have the potential for stable, life-supporting atmospheres. The finding supports continued study of the TRAPPIST-1 system and other top...

www.washington.edu

The erosion of large primary atmospheres typically leaves behind substantial secondary atmospheres on temperate rocky planets - Nature Communications

Many rocky planets formed with large, H2-rich atmospheres. Here, the authors show that the loss of these primary atmospheres from temperate planets such as TRAPPIST-1e typically leaves behind secondary atmospheres and habitable surface conditions.

www.nature.com

 

[NMaude]

New video from Anton Petrov concerning the most powerful gamma-ray source in the Milky Way galaxy:

Hello and welcome! My name is Anton and in this video, we will talk about an unusual source of powerful radiation somewhere in the center of Milky Way, but nobody knows what it is
Links:
https://iopscience.iop.org/article/10...https://www.youtube.com/redirect?ev...rticle/10.3847/2041-8213/ad772e&v=qMQLNlrbW7U
https://svs.gsfc.nasa.gov/14170https://www.youtube.com/redirect?ev...https://svs.gsfc.nasa.gov/14170&v=qMQLNlrbW7U
Wow! signal • Wow! Signal Mystery Solved After 37 Y... https://www.youtube.com/watch?v=2R2NbXhk-VM&t=0s
https://www.hawc-observatory.org/obse...https://www.youtube.com/redirect?ev...atory.org/observatory/tanks.php&v=qMQLNlrbW7U
#milkyway #galaxy #pevatronhttps://www.youtube.com/hashtag/pevatron

0:00 Cosmic ray history
1:40 Different types and energies
2:30 How they are created
3:50 How we find them
4:50 PeVatron discoveries in the Milky Way
6:10 What about galactic center?
7:50 Unknown source
8:10 What we know so far

 

[Flyaway]

First picture of Milky Way black hole ‘may not be accurate’

The first picture of the supermassive black hole at the heart of our Milky Way galaxy may not be a true reflection of its appearance, new research suggests.

First picture of Milky Way black hole ‘may not be accurate’

drupal-media[data-view-mode=half_page_width] { display: inline-block; width: 50%; } The first picture of the supermassive black hole at the heart of our Milky Way ga...

www.ras.ac.uk

Related paper:

An independent hybrid imaging of Sgr A* from the data in EHT 2017 observations

ABSTRACT. We propose that the ring structure found by the Event Horizon Telescope Collaboration (EHTC) as the black hole shadow of Sgr A* is an artefact ca

academic.oup.com