Cool astronomy photos

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Re: Cool astronomy photos

Postby Witness » Sat Dec 02, 2017 3:42 am

Bruce wrote:Ammonia ice. Imagine it. An earth-sized cloud of frozen cat piss.

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Re: Cool astronomy photos

Postby Witness » Sat Dec 09, 2017 12:26 am

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Re: Cool astronomy photos

Postby Anaxagoras » Mon Dec 11, 2017 4:19 pm

The shape of the tree seems to make the moon appear to be not quite spherical.
A fool thinks himself to be wise, but a wise man knows himself to be a fool.
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Re: Cool astronomy photos

Postby Witness » Mon Dec 11, 2017 7:14 pm

Slightly squashed vertically? That would be atmospheric refraction. What I find nice is how reflections on the branches seem to extend the moon's glow. :)




Image
Crossing Horizons
Image Credit & Copyright: Jean-Francois Graffand

Explanation: Follow this vertical panoramic view from horizon to horizon and your gaze will sweep through the zenith of a dark night sky over Pic du Midi mountaintop observatory. To make the journey above a sea of clouds, 19 single exposures were taken near the end of night on October 31 and assembled in a mercator projection that renders the two horizons flat. Begin at the top and you're looking east toward the upsidedown dome of the observatory's 1 meter telescope. It's easy to follow the plane of our Milky Way galaxy as it appears to emerge from the dome and angle down toward the far horizon. Just to its right, the sky holds a remarkable diffuse glow of zodiacal light along our Solar System's ecliptic plane. Zodiacal light and Milky Way with star clusters, cosmic dust clouds and faint nebulae, cross near the zenith. Both continue down toward the airglow in the west. They disappear near the western horizon at the bottom, beyond more Pic du Midi observatory domes and a tall communications relay antenna.
https://apod.nasa.gov/apod/ap171125.html

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Re: Cool astronomy photos

Postby Abdul Alhazred » Mon Dec 11, 2017 11:42 pm

Best viewed full screen with sound off.

https://www.youtube.com/watch?v=g-sk_cH6MXc

More explanation:
https://apod.nasa.gov/apod/ap171211.html
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Re: Cool astronomy photos

Postby Anaxagoras » Thu Dec 14, 2017 12:19 pm

Saturn's rings puzzle me. Apparently they puzzle astronomers too.

http://www.sciencemag.org/news/2017/12/ ... tions-show

NEW ORLEANS, LOUISIANA—The rings of Saturn seem like permanent fixtures in the solar system, firing the imagination of poets and scientists alike. But observations made this year, in the final months of NASA’s Cassini spacecraft, and reported here at a meeting of the American Geophysical Union (AGU) show they are surprisingly youthful: Until a few hundred million years ago, they did not exist. Saturn acquired its jewels relatively late in life. If any astronomers had gazed at the sky in the time of the dinosaurs, they might have seen a bare and boring Saturn.

It was then that some sort of catastrophe struck the gas giant. Perhaps a stray comet or asteroid struck an icy moon, tossing its remnants into orbit. Or maybe the orbits of Saturn’s moons somehow shifted, and the resulting gravitational tug-of-war pulled a moon apart. However it happened, two new lines of evidence from Cassini make it clear that the rings were not around in the early days of the solar system 4.5 billion years ago, as scientists had long believed, says Jeff Cuzzi, a ring specialist at NASA’s Ames Research Center in Mountain View, California. “It rules out the primordial ring story,” Cuzzi says. “That’s what it looks like to me.”


Some of those theories sound ridiculous to me. Particularly the one about somehow the orbits of Saturn's moons shifting and causing a "gravitational tug of war".

A comet colliding with a moon sounds like a good theory to me.
A fool thinks himself to be wise, but a wise man knows himself to be a fool.
William Shakespeare

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Re: Cool astronomy photos

Postby Abdul Alhazred » Thu Dec 14, 2017 11:48 pm

Best viewed full screen with sound off.

https://www.youtube.com/watch?v=uj3Lq7Gu94Y

More explanation:
https://apod.nasa.gov/apod/ap171214.html
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Re: Cool astronomy photos

Postby Bruce » Fri Dec 15, 2017 1:05 am

American Geophysical Union

Imagine the wild parties they have. You know, after they debate about the formation of Saturn's rings.
Such potential!

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Re: Cool astronomy photos

Postby Witness » Fri Dec 15, 2017 6:08 am

Image
Voyager 2 approach movie - brown barge
This movie is based on 66 violet color filter frames obtained by the Voyager 2 spacecraft on (almost) every Jovian rotation from April 26, 1979 to May 24 1979. All images are aligned on the brown barge located in the North Equatorial belt.

From the Bruce Murray Space Image Library, lots of pics.

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Re: Cool astronomy photos

Postby Witness » Sun Dec 24, 2017 5:34 am

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Re: Cool astronomy photos

Postby Abdul Alhazred » Sun Dec 24, 2017 11:39 am

OK. What is it?
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Re: Cool astronomy photos

Postby Abdul Alhazred » Sun Dec 24, 2017 11:56 am

OK. That does it.

We ARE living in The FutureTM.

https://apod.nasa.gov/apod/ap171224.html
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Re: Cool astronomy photos

Postby sparks » Sun Dec 24, 2017 8:04 pm

That'd be us.

Continuously rotating per ed.



He does keep it all going, after all.
And from Florida.
Nice things? Hell no!

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Re: Cool astronomy photos

Postby Witness » Tue Dec 26, 2017 3:39 am


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Re: Cool astronomy photos

Postby Witness » Sat Dec 30, 2017 4:31 am

Image
APOD wrote:Explanation: Why is there a spiral around the North Pole of Mars? Each winter this pole develops a new outer layer about one meter thick composed of carbon dioxide frozen out of the thin Martian atmosphere. This fresh layer is deposited on a water-ice layer that exists year round. Strong winds blow down from above the cap's center and swirl due to the spin of the red planet -- contributing to Planum Boreum's spiral structure. The featured image is a perspective mosaic generated earlier this year from numerous images taken by ESA's Mars Express and elevations extracted from the laser altimeter aboard NASA's Mars Global Surveyor mission. New missions to Mars planned in the next few years include Insight with plans to drill into Mars, and ExoMars and the Mars 2020 Rover with plans to search for signs of microscopic Martian life -- past and present.
https://apod.nasa.gov/apod/ap171219.html

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Re: Cool astronomy photos

Postby Witness » Wed Jan 03, 2018 7:29 pm

Image
Astronomy.com wrote:Arecibo's restored radar captures new images of asteroid 3200 Phaethon

Arecibo Observatory resumed radar operations just in time to capture images of the second-largest “potentially hazardous” asteroid in Earth’s proximity.
http://www.astronomy.com/news/2017/12/restored-radar-captures-new-images-of-asteroid-3200-phaethon

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Re: Cool astronomy photos

Postby Witness » Thu Jan 04, 2018 5:12 am

Image
NGC 5256, also known as Markarian 266, is about 350 million light-years away from Earth, in the constellation of Ursa Major (The Great Bear). It is composed of two disc galaxies whose nuclei are currently just 13 000 light-years apart. Their constituent gas, dust, and stars are swirling together in a vigorous cosmic blender, igniting newborn stars in bright star formation regions across the galaxy.
[…]
In addition to the bright and chaotic features, each merging galaxy of NGC 5256 contains an active galactic nucleus, where gas and other debris are fed into a hungry supermassive black hole. Observations from NASA’s Chandra X-ray Observatory show that both of these nuclei — and the region of hot gas between them — have been heated by shock waves created as gas clouds collide at high velocities.
[…]
Also in this Hubble image is another pair of probably interacting galaxies — they are hiding to the right of NGC 5256 in the far distance, and have not yet been explored by any astronomer.
[…]
NGC 5256 has previously been imaged by Hubble as part of a collection of 59 images of merging galaxies, released on Hubble’s 18th anniversary on 24 April 2008. This new image adds H-alpha data taken from the Wide-Field Camera 3 to the previously available data, making the gas visible.
https://www.spacetelescope.org/news/heic1720/

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Re: Cool astronomy photos

Postby Fid » Fri Jan 05, 2018 2:29 am

Witness wrote:Image
Astronomy.com wrote:Arecibo's restored radar captures new images of asteroid 3200 Phaethon

Arecibo Observatory resumed radar operations just in time to capture images of the second-largest “potentially hazardous” asteroid in Earth’s proximity.
http://www.astronomy.com/news/2017/12/restored-radar-captures-new-images-of-asteroid-3200-phaethon


Well at least they got "El Radar" up and running.

Seriously though the second largest radio telescope up and running should that really take ...naa I ain't going there.
Ya'll take care and have a happy and prosperous new year.
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Re: Cool astronomy photos

Postby Witness » Sun Jan 07, 2018 5:21 am

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Re: Cool astronomy photos

Postby Witness » Sun Jan 07, 2018 2:51 pm

Image
Brilliant hues of blue and gold are smeared across Saturn's cloud tops in this view from NASA's Cassini spacecraft. Citizen scientist Kevin Gill processed the image using near-infrared data that the spacecraft collected just before it passed through Saturn's ring plane in December of 2012.


Image
Jupiter's swirling cloud tops look like a sheet of blue velvet in a new image from NASA's Juno probe. Citizen scientists Gerald Eichstädt and Seán Doran created the image using raw data from the JunoCam instrument on Juno.

https://www.space.com/32252-amazing-images.html


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