This image taken May 29-30, 1999, and released April 24, 2003, shows a bubbly ocean of glowing hydrogen gas and small amounts of other elements, such as oxygen and sulfur. The photograph captures a region 3 light-years across within M17, a hotbed of star formation. M17, also known as the Omega or Swan Nebula, is located about 5,500 light-years away in the constellation Sagittarius.
(Photo: AP/NASA)
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