Friday, November 11, 2005

bubble versus cloud


bubble_croman
Originally uploaded by Bill Kerr.
What an amazing photo from the Astronomy Picture of the Day site!

The bubble nebula is being pushed by the stellar winds of a giant star inside it.

A molecular cloud of hydrogen gas contains the further expansion of the bubble. But the radiation from the giant star inside the bubble is causing the molecular cloud to heat up and glow.

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