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Astronomy Picture of the Day -- Sharpless 308: Star Bubble
NASA ^ | December 24, 2013 | (see photo credit)

Posted on 12/24/2013 7:46:27 PM PST by SunkenCiv

Explanation: Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a Full Moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured in the expansive image is dominated by the glow of ionized oxygen atoms mapped to violet hues.

December 24, 2013

(Excerpt) Read more at ...

TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; bubble; science; sharpless2308; spacebubble; starbubble
[Credit & Copyright: Jeff Husted]

1 posted on 12/24/2013 7:46:27 PM PST by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...
The Big One

2 posted on 12/24/2013 7:47:37 PM PST by SunkenCiv (
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To: SunkenCiv
Kind of a cosmic version of one of those Harold Edgerton Rapatronic pictures:


3 posted on 12/24/2013 9:36:27 PM PST by Steely Tom (If the Constitution can be a living document, I guess a corporation can be a person.)
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To: Steely Tom
60 light years in diameter? LOL - the theorized Oort cloud is only ONE light year across!

4 posted on 12/24/2013 10:28:49 PM PST by Talisker (One who commands, must obey.)
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