NGC 1929 Superbubble, N44 Nebula
The vast emission nebula N44 in our neighboring galaxy the Large Magellanic Cloud has a large, 250 light-year hole. A possiblity for this is particle winds expelled by massive stars in the bubble's interior that are pushing out the glowing gas. This answer has been recently found to be inconsistent with measured wind velocities, however. Another possibility is that the expanding shells of old supernovas have sculpted the unusual space cavern. An unexpected clue of hot X-ray emitting gas was recently been detected escaping the N44 superbubble. NGC 1929 lies in the Large Magellanic Cloud, a satellite galaxy of our Milky Way that is some 160,000 light years from Earth.
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Photo credit: © Photo Researchers / Alamy / Afripics
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