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• a  outside or beyond a galaxy
  extragalactic nebula

• They may be distinguished by calling the local patches galactic nebulae, the great outer star clusters extragalactic nebulae.
• Other astronomers have also looked for extragalactic molecules, but without any luck.
• Since the 1930s, for example, astronomers at California's Hale Observatories have photographed some 200 extragalactic supernovae.

News & Articles

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• New findings on makeup of universe may spawn research
  New areas of extragalactic study may emerge from research by astrophysicists using data from the Chandra Space Telescope to conclude that baryons making up all visible matter – once thought to be missing from clusters – are present in the expected ratios in large, luminous clusters.
  July 16, 2013 - Science Daily