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Interstellar medium: Quick Facts

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Facts

Also Known As ISM

Photos

Detail of the Cygnus Loop.This nebula is the product of a supernova explosion; in this section, the blast wave has encountered an area of dense interstellar gas, creating turbulence in the wave and causing it to glow. The picture is a composite of three images taken by the Hubble Space Telescope.
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Key People

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Otto Struve
American astronomer
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Robert Julius Trumpler
American astronomer

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