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Astronomy Picture of the Day -- The Medusa Nebula
NASA ^ | October 25, 2012 | (see photo credit)

Posted on 10/25/2012 3:46:19 AM PDT by SunkenCiv

Explanation: Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation. The planetary nebula phase represents a final stage in the evolution of low mass stars like the sun, as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers. Ultraviolet radiation from the hot star powers the nebular glow. The Medusa's transforming star is near the center of the overall bright crescent shape. In this deep telescopic view, fainter filaments clearly extend below and to the left of the bright crescent region. The Medusa Nebula is estimated to be over 4 light-years across.

October 25, 2012

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; medusanebula; science
[Credit & Copyright: Ken Crawford (Rancho Del Sol Obs.)]

1 posted on 10/25/2012 3:46:24 AM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...

2 posted on 10/25/2012 3:49:51 AM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv

Thanks, that sent me on a half hour tangent thru wikipedia relearning a lot of astronomy.


3 posted on 10/25/2012 4:31:37 AM PDT by RadiationRomeo (Step into my mind and glimpse the madness that is me)
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To: SunkenCiv

It’s that big, planet-eating bugle from Star Trek! Quick, drive a Chevy Volt into the center of it! That’s how you stop it! The Chevy Volt, a worthless car, but it saved the earth from an attack from a huge, salty snack food.


4 posted on 10/25/2012 5:57:37 AM PDT by blueunicorn6 ("A crack shot and a good dancer")
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To: SunkenCiv; All

FYI and Catastrophism?


5 posted on 10/25/2012 12:01:21 PM PDT by gleeaikin
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To: SunkenCiv

Thank you for the post and ping, Mr. Civilizations.

I can see Medusa in your thumbnail, but the closeup of the nebula doesn’t show her face. Good thing, too. I’d hate to turn to stone.


6 posted on 10/25/2012 1:52:23 PM PDT by TheOldLady
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To: TheOldLady

Medusa isn’t a big favorite, [everyone starts to brace themselves] I’ve always preferred Osteopathusa, or even Chiropradusa.


7 posted on 10/25/2012 6:44:41 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv

You left out Naturopathusa.


8 posted on 10/26/2012 8:54:03 AM PDT by TheOldLady
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