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Old 05-13-2019, 09:35 PM   #1
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Astronomy Picture of the Day.


https://apod.nasa.gov/apod/archivepix.html




Virtual Flyby of the Whirlpool Galaxy
Video Credit: F. Summers, J. DePasquale, and D. Player (STScI); Music:
(Jingle Punks via Youtube) Explanation: What would it look like to fly over a spiral galaxy? To help visualize this, astronomers and animators at the Space Telescope Science Institute computed a virtual flyby of the Whirlpool Galaxy (M51) using data and images from the Hubble Space Telescope. At only 25 million light years distant and fully 50 thousand light years across, the Whirlpool is one of the brightest and most picturesque galaxies on the sky. Visible during the virtual flyby are spiral arms dominated by young blue stars, older lighter-colored stars, dark lanes of dust, and bright red emission nebulae. Many galaxies far in the distance can be seen right through M51. The visualization should be considered a time-lapse, because otherwise the speed of the virtual camera would need to be very near the speed of light.

Tomorrow's picture: interstellar tapestry
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Old 05-13-2019, 09:43 PM   #2
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Re: Astronomy Picture of the Day.


Just another quick look.



The Cat's Eye Nebula in Optical and X-ray
Image Credit: NASA, ESA, Hubble Legacy Archive; Chandra X-ray Obs.;
Processing & Copyright: Rudy Pohl
Explanation: To some it looks like a cat's eye. To others, perhaps like a giant cosmic conch shell. It is actually one of brightest and most highly detailed planetary nebula known, composed of gas expelled in the brief yet glorious phase near the end of life of a Sun-like star. This nebula's dying central star may have produced the outer circular concentric shells by shrugging off outer layers in a series of regular convulsions. The formation of the beautiful, complex-yet-symmetric inner structures, however, is not well understood. The featured image is a composite of a digitally sharpened Hubble Space Telescope image with X-ray light captured by the orbiting Chandra Observatory. The exquisite floating space statue spans over half a light-year across. Of course, gazing into this Cat's Eye, humanity may well be seeing the fate of our sun, destined to enter its own planetary nebula phase of evolution ... in about 5 billion years.

Tomorrow's picture: exercise, exercise, exercise
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Old 05-14-2019, 07:18 AM   #3
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Re: Astronomy Picture of the Day.


Interesting video. It's hard for my tiny brain to appreciate that massive scale of such things. The video provides a perspective that no human could achieve, likely under any technology. It flies the 50,000 LY breadth of the galaxy is about 45 seconds.
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Old 05-14-2019, 08:16 AM   #4
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Re: Astronomy Picture of the Day.


Pretty intense.
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Old 05-19-2019, 06:56 PM   #5
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Re: Astronomy Picture of the Day.


There is a huge archive here.

https://apod.nasa.gov/apod/archivepix.html
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Old 05-21-2019, 07:12 AM   #6
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Re: Astronomy Picture of the Day.


Well, isn't that fascinating.
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