NASA Picture
February 10, 2014
I chose the NASA photo of the day from December 24, 2013. The photo is of a huge cosmic bubble which was created by a Wolf-Rayet star, located near the center of the nebula. It is so great is size that in covers the sky slightly more than a Full Moon. Wolf-Rayet stars have over 20 times the mass of the Sun and their hot, fast winds sweep up slower moving material from an earlier phase of evolution.
How often do cosmic bubbles form? Good job with the description!
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