The star cluster NGC 2060 is a loose collection of stars that are no longer gravitationally bound to each other. The stellar grouping will disperse in a few million years. It contains a supernova that exploded about 10,000 years ago, blowing out gas surrounding it. The dark region below the cluster is a dense cloud of dust lying in front of it.
30 Doradus is the brightest, nearby star-forming region and home to the most massive stars in our cosmic neighborhood of about 25 galaxies. The nebula is close enough to Earth that Hubble can resolve individual stars, giving astronomers important information about the stars' birth and evolution. 30 Doradus resides 170,000 light-years away in the Large Magellanic Cloud, a small, satellite galaxy of our Milky Way.
Image Credit: NASA, ESA
Explanation from: http://hubblesite.org/newscenter/archive/releases/2012/01/image/e/
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