SPACE PHOTOS THIS WEEK: Massive Galaxy Cluster, More

SPACE PHOTOS THIS WEEK: Massive Galaxy Cluster, More
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August 22, 2008--NASA's Spitzer Space Telescope snapped a stellar family portrait showcasing the different generations found in star-forming region W5.

The site lies 6,500 light-years away in the constellation Cassiopeia.

The infrared image backs a star-formation theory in which radiation and winds from massive stars created two large cavities and compressed surrounding gasses to spawn new stars.

The oldest blue stars are seen in the cavity centers, while others become progressively younger with distance from that point.
—Image by NASA/JPL-Caltech/Harvard-Smithsonian CfA
 
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