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Astronomy Picture of the Day -- Airglow, Gegenschein, and Milky Way
NASA ^ | April 20, 2013 | (see photo credit)

Posted on 04/20/2013 4:26:09 PM PDT by SunkenCiv

Explanation: As far as the eye could see, it was a dark night at Las Campanas Observatory in the southern Atacama desert of Chile. But near local midnight on April 11, this mosaic of 3 minute long exposures revealed a green, unusually intense, atmospheric airglow stretching over thin clouds. Unlike aurorae powered by collisions with energetic charged particles and seen at high latitudes, the airglow is due to chemiluminescence, the production of light in a chemical reaction, and found around the globe. The chemical energy is provided by the Sun's extreme ultraviolet radiation. Like aurorae, the greenish hue of this airglow does originate at altitudes of 100 kilometers or so dominated by emission from excited oxygen atoms. The gegenschein, sunlight reflected by dust along the solar system's ecliptic plane was still visible on that night, a faint bluish cloud just right of picture center. At the far right, the Milky Way seems to rise from the mountain top perch of the Magellan telescopes. Left are the OGLE project and du Pont telescope domes.

April 20, 2013

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; atacamadesert; chile; science
[Credit & Copyright: Yuri Beletsky (Las Campanas Observatory, Carnegie Institution)]

1 posted on 04/20/2013 4:26:09 PM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...

2 posted on 04/20/2013 4:26:39 PM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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Not bad for a landscape shot.

http://129.164.179.22/apod/image/1304/air_campxBeletsky.jpg


3 posted on 04/20/2013 4:27:51 PM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv

He must have used an equatorial mount. If the shot was a minute long the stars would streak. I know, I’ve photographed the milky way myself in the desert.


4 posted on 04/20/2013 4:45:29 PM PDT by cicero2k
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To: SunkenCiv

Very nice...thanks...


5 posted on 04/20/2013 4:47:41 PM PDT by caww
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To: FRiends


Click the Pic
Help fill the Free Republic food bowl


Support Free Republic

6 posted on 04/20/2013 4:47:59 PM PDT by deoetdoctrinae (The Old White Flag Republicans can go straight to He// and take their pal Obama with them!)
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To: SunkenCiv

Is that a tel on the horizon?


7 posted on 04/20/2013 4:50:52 PM PDT by BenLurkin (This is not a statement of fact. It is either opinion or satire; or both)
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To: SunkenCiv
"Gegenschein ... Darling, Gegenschein..."
8 posted on 04/20/2013 4:51:22 PM PDT by mikrofon (APOD Bump)
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To: SunkenCiv

Wow! That is indeed amazing for an Earth based imagine! Though, I do prefer the pics you take from outer space. Always very nice of you to post them here first.


9 posted on 04/20/2013 4:52:13 PM PDT by KoRn (Department of Homeland Security, Certified - "Right Wing Extremist")
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To: BenLurkin

I can’t tel, ;’) but since it’s in Chile, I’ll guess no.


10 posted on 04/20/2013 5:50:20 PM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: cicero2k
He must have used an equatorial mount. If the shot was a minute long the stars would streak. I know, I’ve photographed the milky way myself in the desert.

You sure about that? About 30 years ago, I remember trying to get streaking star pictures. I remember a 15 minute exposure would result in a tiny streak. I imagine 1 minute would hardly result in any streak at all.

11 posted on 04/20/2013 5:55:12 PM PDT by Paradox (Unexpected things coming for the next few years.)
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To: SunkenCiv

Not sure I see the Gegenschein but that is one beautiful pic.


12 posted on 04/20/2013 6:34:15 PM PDT by TigersEye (If babies had guns they wouldn't be aborted)
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To: mikrofon

LOL


13 posted on 04/20/2013 6:35:27 PM PDT by TigersEye (If babies had guns they wouldn't be aborted)
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