Cool astronomy photos

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Re: Cool astronomy photos

Postby Witness » Tue Jan 16, 2018 2:46 am

Abdul Alhazred wrote:
Anaxagoras wrote:My guess is a little white dot at the center of the screen (or in the direction of travel) and nothing else. That's just a guess though.


Asimov described it in one of his science columns.

Rainbows around your equator. A glow in front. Nothing visible behind.

Depends on your speed. The "garden hose effect" pushes everything in front of you (extreme case of what astronomers call "light aberration").
I doubt very much that the equator would play any special role.

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Re: Cool astronomy photos

Postby Witness » Tue Jan 16, 2018 2:48 am

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Science News wrote:Steep slopes on Mars reveal structure of buried ice on Red Planet

Summary:
Researchers have found eight sites where thick deposits of ice beneath Mars' surface are exposed in faces of eroding slopes. The ice was likely deposited as snow long ago. The deposits hold clues about Mars' climate history and also may make frozen water more accessible than previously thought to future robotic or human exploration missions.
https://www.sciencedaily.com/releases/2018/01/180111141713.htm

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Re: Cool astronomy photos

Postby Anaxagoras » Thu Feb 01, 2018 11:58 pm

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Re: Cool astronomy photos

Postby Witness » Sat Feb 03, 2018 1:51 am

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New Horizons' optical navigation images of Pluto and Charon aligned on background stars

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Re: Cool astronomy photos

Postby Witness » Sat Feb 03, 2018 5:10 pm


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Re: Cool astronomy photos

Postby Anaxagoras » Mon Feb 05, 2018 11:28 am

So I guess Curiosity has been on Mars for over 5 years by now (earth years). In that time it has gone a grand total of . . . 11 miles. Whoopee!!

https://www.denverpost.com/2018/02/05/c ... mars-photo

Eta: 5 1/2 years, so it averages 2 miles per year. Even a slowpoke human being would walk about 2 miles per hour. 3 is more typical. Not complaining, just a point of reference. This thing is slow.
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Re: Cool astronomy photos

Postby Rob Lister » Mon Feb 05, 2018 1:01 pm

Anaxagoras wrote:So I guess Curiosity has been on Mars for over 5 years by now (earth years). In that time it has gone a grand total of . . . 11 miles. Whoopee!!

https://www.denverpost.com/2018/02/05/c ... mars-photo

Eta: 5 1/2 years, so it averages 2 miles per year. Even a slowpoke human being would walk about 2 miles per hour. 3 is more typical. Not complaining, just a point of reference. This thing is slow.


I never considered that. Turns out the reason is extreme caution.
https://www.quora.com/Why-dont-Mars-rovers-move-faster

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Re: Cool astronomy photos

Postby Witness » Wed Feb 07, 2018 10:54 pm

Rob Lister wrote:Turns out the reason is extreme caution.
There's also the fact that radio waves take on the order of minutes to get there (and then back), so you can't drive in real time anyway.

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Re: Cool astronomy photos

Postby Fid » Fri Feb 09, 2018 2:11 am

Looks like Utah or Arizona. Fake? I shall ask Alex Jones.
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Re: Cool astronomy photos

Postby Fid » Fri Feb 09, 2018 2:27 am



It seems a very angry planet, I thought it would be nicer (Edgar Rice lied!)
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Re: Cool astronomy photos

Postby Anaxagoras » Mon Feb 12, 2018 3:12 am

New Horizons is still sending back photos of kuiper belt objects:

https://www.npr.org/sections/thetwo-way ... from-earth

They also had this video, with a Ray Bradbury poem:

https://www.youtube.com/watch?v=sEg4D7s3fOs
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Re: Cool astronomy photos

Postby Doctor X » Mon Feb 12, 2018 6:12 am

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Re: Cool astronomy photos

Postby Witness » Wed Feb 14, 2018 5:24 pm

And old Hubble also persists in encumbering Humanity with new data.

Image
PLCK G004.5-19.5 was discovered by ESA’s Planck satellite through the Sunyaev-Zel’dovich effect — the distortion of the cosmic microwave background radiation in the direction of the galaxy cluster, by high energy electrons in the intracluster gas.

The large galaxy at the center is the brightest galaxy in the cluster and the dominant object in this image, and above it a thin, curved gravitational lens arc is visible.

This is caused by the gravitational forces of the cluster bending the light from stars and galaxies behind it, in a similar way to how a glass lens bends light.

Several stars are visible in front of PLCK G004.5-19.5 — recognizable by their diffraction spikes — but aside from these, all other visible objects are distant galaxies.
[…]
This image of PLCK G004.5-19.5 was taken by Hubble’s Advanced Camera for Surveys (ACS) and Wide-Field Camera 3 (WFC3) instruments as part of an extensive observing program called Reionization Lensing Cluster Survey (RELICS).

RELICS imaged 41 massive galaxy clusters over the course of 390 Hubble orbits and 100 Spitzer Space Telescope observing hours, aiming to find the brightest distant galaxies.
http://www.sci-news.com/astronomy/hubble-giant-galaxy-cluster-05714.html

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Re: Cool astronomy photos

Postby Witness » Fri Feb 16, 2018 3:35 am

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From Cassini's closest flyby of Mimas. Herschel crater on the right.

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Re: Cool astronomy photos

Postby Anaxagoras » Fri Feb 16, 2018 6:09 am

That's no moon!

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Re: Cool astronomy photos

Postby Witness » Sat Feb 17, 2018 1:47 am

↑ I refrained, as it was too easy. :mrgreen: From the original link:
In this view captured by NASA's Cassini spacecraft on its closest-ever flyby of Saturn's moon Mimas, large Herschel Crater dominates Mimas, making the moon look like the Death Star in the movie "Star Wars."
https://www.reddit.com/r/spaceporn/comments/7xag1c/in_this_view_captured_by_nasas_cassini_spacecraft/?st=jdm3qvz1&sh=4907b4bb

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Re: Cool astronomy photos

Postby Anaxagoras » Wed Feb 21, 2018 5:52 am

The Trump Administration plans to cancel the WFIRST space telescope:

https://www.forbes.com/sites/startswith ... 2fd48857b0

BTW, the James Webb space telescope, which had been planned to be launched this year, is now scheduled to be launched next year. It's a huge gamble too:

https://www.scientificamerican.com/arti ... g-to-fail/

If everything goes right, it will be spectacular. Just hope everything works the way it's supposed to.
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Re: Cool astronomy photos

Postby Grammatron » Wed Feb 21, 2018 6:07 am

I wonder if James Webb telescope has the most delayed launches of any project at this point.
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Re: Cool astronomy photos

Postby Abdul Alhazred » Wed Feb 21, 2018 10:18 am

If you're going to name a telescope after a non-astronomer, he's the one.

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Re: Cool astronomy photos

Postby sparks » Wed Feb 21, 2018 11:29 am

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