Monday, March 24, 2008

160,400 years ago, a star went supernova in a small neighboring galaxy

400 years ago, some of the light from the supernova reached Earth directly.

Most of the light is in an expanding shell that is now 400 light years in radius, and some of that light has illuminated dust 400 light years from the supernova itself, creating a "light echo". Since the light hitting the dust had to travel 400 light years farther than the light that came directly toward Earth, we see that light echo now.

The video is just astonishing.
http://chandra.harvard.edu/photo/2008/snr0509/E509_lg_web.mpg

http://www.universetoday.com/2008/03/23/light-echos-from-400-year-old-supernova-observed-time-lapse-video/

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