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Re: The Astronomy Thread

Posted: Sat Apr 16, 2022 12:46 pm
by mwightman
I agree, as do the space or rather star whales called "Galeen"; these space whales - https://tardis.fandom.com/wiki/Star_whale,
. . . . . . . . . . not these space whales - http://www.spacewhales.net/

Re: The Astronomy Thread

Posted: Tue Apr 19, 2022 6:48 am
by Mercy Machine
Space Angels too.Image

Re: The Astronomy Thread

Posted: Wed Apr 20, 2022 8:20 pm
by Arioch
Phobos transits the Sun, viewed from Mars' surface.


Re: The Astronomy Thread

Posted: Thu Apr 21, 2022 3:56 am
by GeoModder
Now if only Phobos was four times larger...

Re: The Astronomy Thread

Posted: Fri May 13, 2022 5:57 pm
by Arioch
The new Event Horizon radio image of Sgr A* (our galaxy's central black hole) inset with x-ray (blue) and infrared (purple and orange) images from Chandra and Hubble of its immediate environment. The inset image of the black hole is about 10 light minutes across, and the main image of the environment is about 7 light years across. Sgr A* is about 27,000 light-years away.

Image

From what I understand, the activity around Sgr A* is very variable; I hope they release a time lapse video of the different states.

Re: The Astronomy Thread

Posted: Fri May 13, 2022 11:57 pm
by avatar576
Here's a computer sim of stars orbiting Sgr A* based on a time lapse captured over a 20-year period. The actual time lapse video is at 0:58:

Re: The Astronomy Thread

Posted: Sat May 14, 2022 11:45 pm
by Arioch
I wonder how many hundreds or thousands of stellar mass block holes are also orbiting on the vicinity. I believe there's some evidence for at least some of them.

Re: The Astronomy Thread

Posted: Fri May 20, 2022 3:29 pm
by Demarquis
Ask and ye shall receive: https://www.youtube.com/watch?v=PvL2BAkEVGU

Your answer appears at about 38 seconds.

Re: The Astronomy Thread

Posted: Sat May 21, 2022 4:40 am
by Arioch
Yeah, I'd seen that information (though not this specific video). I mean the JWST should be able to shed light on this with much higher resolution infrared surveys of that region.

Re: The Astronomy Thread

Posted: Sun May 29, 2022 5:23 am
by Arioch
I love these things.


Re: The Astronomy Thread

Posted: Mon May 30, 2022 6:43 am
by GeoModder
Its definitely spooky.

Re: The Astronomy Thread

Posted: Mon May 30, 2022 1:27 pm
by Demarquis
I once saw a recreation of a journey the entire universe in an IMAX theater. It felt like I was having a religious experience.

Re: The Astronomy Thread

Posted: Sat Sep 03, 2022 1:10 am
by icekatze
hi hi

The first ever direct image of an exoplanet is captured by James Webb.

Previously, astronomers only had indirect methods, like waiting for a planet to pass in front of a star and measuring the change in brightness. While everyone else might be awed by the very photogenic images of galaxies and nebula, this is the image I've been waiting to see.

Re: The Astronomy Thread

Posted: Sat Sep 03, 2022 3:38 am
by Demarquis
There have been other pictures of exoplanets before, but this is the first one by the Webb.

Re: The Astronomy Thread

Posted: Sat Sep 03, 2022 5:36 pm
by Arioch
Demarquis wrote:
Sat Sep 03, 2022 3:38 am
There have been other pictures of exoplanets before, but this is the first one by the Webb.
Yes, there are some in this very thread.

Re: The Astronomy Thread

Posted: Sat Oct 15, 2022 6:01 pm
by Arioch
The gamma ray burst caused by the formation of a black hole.
https://apod.nasa.gov/apod/ap221015.html

Image

Re: The Astronomy Thread

Posted: Thu Feb 16, 2023 8:26 pm
by Arioch
A new theory to explain why most of the discovered inner exoplanet systems tend to be self-similar: that is, the terrestrial planets seem to be mostly the same size as other nearby planets.


Re: The Astronomy Thread

Posted: Sun Feb 19, 2023 11:42 pm
by Demarquis
IIUC, this should slightly increase the probability of two or more life bearing planets in the same system.

Re: The Astronomy Thread

Posted: Mon Feb 20, 2023 1:54 am
by Arioch
Demarquis wrote:
Sun Feb 19, 2023 11:42 pm
IIUC, this should slightly increase the probability of two or more life bearing planets in the same system.
I think it has always been the assumption that inner planets are terrestrial (since the solar winds blow the volatiles away); I don't think whether an Earth is next to other Earth-sized planets or other Super-Earth-sized planets has any impact on Earth's potential habitability. (Venus and Mars being "Earth-sized" for the purposes of this theory.)

And I think astronomers' classification of "super-earths" is pretty sketchy, including a lot of planets that are probably more like Uranus than Earth.

Re: The Astronomy Thread

Posted: Wed Feb 22, 2023 4:34 am
by Demarquis
I did say "slightly"!