Cool astronomy photos

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Re: Cool astronomy photos

Postby Anaxagoras » Tue Jan 09, 2018 1:46 am

There's a lot of cool images in this one:

Most images of black holes are illustrations. Here’s what our telescopes actually capture.

One example:
Image

There's also some nice moving Gifs.
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Re: Cool astronomy photos

Postby Doctor X » Tue Jan 09, 2018 2:19 am

Why it not black?

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Re: Cool astronomy photos

Postby Witness » Tue Jan 09, 2018 2:52 am

↑ Gravitation is more efficient at converting matter to energy than fission or fusion.




Image
Explanation: What are those red clouds surrounding the Andromeda galaxy? This galaxy, M31, is often imaged by planet Earth-based astronomers. As the nearest large spiral galaxy, it is a familiar sight with dark dust lanes, bright yellowish core, and spiral arms traced by clouds of bright blue stars. A mosaic of well-exposed broad and narrow-band image data, this colorful portrait of our neighboring island universe offers strikingly unfamiliar features though, faint reddish clouds of glowing ionized hydrogen gas in the same wide field of view. These ionized hydrogen clouds surely lie in the foreground of the scene, well within our Milky Way Galaxy. They are likely associated with the pervasive, dusty interstellar cirrus clouds scattered hundreds of light-years above our own galactic plane.
https://apod.nasa.gov/apod/astropix.html

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Re: Cool astronomy photos

Postby Witness » Fri Jan 12, 2018 4:48 am

The Earth-Moon system, as imaged by NASA's OSIRIS-REx mission. Credit: NASA/OSIRIS-REx team and the University of Arizona [composite image]

Image

On September 8th, 2016, NASA’s Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission was launched into space. In the coming months, this space probe will approach and then rendezvous with the asteroid 101955 Bennu – a Near-Earth Object (NEO) – for the sake of studying it. The mission will also acquire samples of the asteroid, which will be returned to Earth by 2023.

The OSIRIS-REx mission is an historic one, since it will be the first US spacecraft to conduct a sample-return mission with an asteroid. In the meantime, as the probe has makes its way further into space, it has been providing some truly breathtaking images of the journey. Consider the recently-released composite image of the Earth-Moon system, which NASA created using images that were taken by the probe on October 2nd, 2017.
https://www.universetoday.com/138192/heres-earth-moon-seen-osiris-rex/

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Re: Cool astronomy photos

Postby sparks » Sat Jan 13, 2018 12:57 am

I drove my last automobile that distance.



I did not make it back...
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Re: Cool astronomy photos

Postby Witness » Sat Jan 13, 2018 2:14 am

sparks wrote:I drove my last automobile that distance.



I did not make it back...
NASA will send a crate of single malt to the marooned. :wink:

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Re: Cool astronomy photos

Postby Witness » Mon Jan 15, 2018 6:43 am

NASA wrote:By combining the visible and infrared capabilities of the Hubble and Spitzer space telescopes, astronomers and visualization specialists from NASA’s Universe of Learning program have created a spectacular, three-dimensional, fly-through movie of the magnificent Orion nebula, a nearby stellar nursery. Using actual scientific data along with Hollywood techniques, a team at the Space Telescope Science Institute in Baltimore, Maryland, and the Caltech/IPAC in Pasadena, California, has produced the best and most detailed multi-wavelength visualization yet of the Orion nebula. Credit: Space Telescope Science Institute


https://www.youtube.com/watch?v=xCFg5udYbAg

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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Jan 15, 2018 11:57 am

Very impressive, but it does not really show what you would see because it ignores the relativistic effects of moving that fast.
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Re: Cool astronomy photos

Postby Anaxagoras » Mon Jan 15, 2018 12:32 pm

Abdul Alhazred wrote:Very impressive, but it does not really show what you would see because it ignores the relativistic effects of moving that fast.


Smartass.

The Orion Nebula is about 24 light years in diameter so that would mean we traveled 24 light years in 3 minutes. At roughly half a million minutes per year that would put the speed in the ballpark of 4 million times faster than the speed of light.
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Re: Cool astronomy photos

Postby Rob Lister » Mon Jan 15, 2018 1:41 pm

Anaxagoras wrote:
Abdul Alhazred wrote:Very impressive, but it does not really show what you would see because it ignores the relativistic effects of moving that fast.


Smartass.

The Orion Nebula is about 24 light years in diameter so that would mean we traveled 24 light years in 3 minutes. At roughly half a million minutes per year that would put the speed in the ballpark of 4 million times faster than the speed of light.


Is that right? If you were traveling a significant percentage of C, then one ship second can be any number of earth seconds, so depending on that %, it appears to you that you're traveling faster than C.
fun calculator
http://keisan.casio.com/exec/system/1224059993
I'm not at all sure what you would see. I'm guessing nothing.

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Re: Cool astronomy photos

Postby Anaxagoras » Mon Jan 15, 2018 2:14 pm

Rob Lister wrote:
Anaxagoras wrote:
Abdul Alhazred wrote:Very impressive, but it does not really show what you would see because it ignores the relativistic effects of moving that fast.


Smartass.

The Orion Nebula is about 24 light years in diameter so that would mean we traveled 24 light years in 3 minutes. At roughly half a million minutes per year that would put the speed in the ballpark of 4 million times faster than the speed of light.


Is that right? If you were traveling a significant percentage of C, then one ship second can be any number of earth seconds, so depending on that %, it appears to you that you're traveling faster than C.
fun calculator
http://keisan.casio.com/exec/system/1224059993
I'm not at all sure what you would see. I'm guessing nothing.


Well, according to your calculator there, you need to be going something like 99.9999999% C to get time dilation that big.
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Re: Cool astronomy photos

Postby Rob Lister » Mon Jan 15, 2018 2:39 pm

Anaxagoras wrote:
Rob Lister wrote:
Anaxagoras wrote:
Abdul Alhazred wrote:Very impressive, but it does not really show what you would see because it ignores the relativistic effects of moving that fast.


Smartass.

The Orion Nebula is about 24 light years in diameter so that would mean we traveled 24 light years in 3 minutes. At roughly half a million minutes per year that would put the speed in the ballpark of 4 million times faster than the speed of light.


Is that right? If you were traveling a significant percentage of C, then one ship second can be any number of earth seconds, so depending on that %, it appears to you that you're traveling faster than C.
fun calculator
http://keisan.casio.com/exec/system/1224059993
I'm not at all sure what you would see. I'm guessing nothing.


Well, according to your calculator there, you need to be going something like 99.9999999% C to get time dilation that big.


So you're sayin' there's a chance.

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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Jan 15, 2018 4:04 pm

Anaxagoras wrote:
Abdul Alhazred wrote:Very impressive, but it does not really show what you would see because it ignores the relativistic effects of moving that fast.


Smartass.

The Orion Nebula is about 24 light years in diameter so that would mean we traveled 24 light years in subjective 3 minutes ...


Which is possible at relativistic speeds given time dilation.

It's the round trip that's a bitch. :P
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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Jan 15, 2018 4:05 pm

Anaxagoras wrote:Well, according to your calculator there, you need to be going something like 99.9999999% C to get time dilation that big.


Considering that it's a simulation, that is no reason they could not get the appearance right. 8)
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Re: Cool astronomy photos

Postby Rob Lister » Mon Jan 15, 2018 10:19 pm

Abdul Alhazred wrote:
Anaxagoras wrote:Well, according to your calculator there, you need to be going something like 99.9999999% C to get time dilation that big.


Considering that it's a simulation, that is no reason they could not get the appearance right. 8)


That's a damn curiosity right there. Stars are so blue-shifted to you that you can't see anything. OTOH, you're so time-dilated that maybe you can.

We need someone smart here. Let's ask sparks.

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Re: Cool astronomy photos

Postby Anaxagoras » Mon Jan 15, 2018 10:30 pm

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.
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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Jan 15, 2018 10:55 pm

Rob Lister wrote:
Abdul Alhazred wrote:
Anaxagoras wrote:Well, according to your calculator there, you need to be going something like 99.9999999% C to get time dilation that big.


Considering that it's a simulation, that is no reason they could not get the appearance right. 8)


That's a damn curiosity right there. Stars are so blue-shifted to you that you can't see anything. OTOH, you're so time-dilated that maybe you can.

We need someone smart here. Let's ask sparks.


You would see blue shifted in front, red shifted behind, and everything in between, including the cosmic background radiation shifted to visible.

Also everything would seem moved away from the direction of travel.
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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Jan 15, 2018 10:56 pm

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.
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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Jan 15, 2018 10:58 pm

Close enough to C, you'd be blasted by gamma rays from the blue shifted cosmic background in front. :coolspecs:
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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Jan 15, 2018 11:00 pm

I'm pretty sure Poul Anderson covered this in Tau Zero. :)
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