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What is the biggest nebula in the universe?

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Astronomers have discovered this nebula in July 2010, the biggest star in the universe (R136a1). If it is not a star cluster, then it would be 265 times more massive than the Sun and a million times brighter. read more

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. As such, Lyman-alpha blobs would qualify, but they are seen as distinct from nebulae. The biggest nebula discovered so far is the H I region that encapsulates the galaxy NGC 262 in a halo of gas. It’s a spiral nebula that measures 2.600.000 light-years in size. read more

Largest Known Nebula in the Universe Reveals Cosmic Web for 1st Time January 20, 2014 Astronomers have discovered a distant quasar illuminating a vast nebula of diffuse gas, revealing, for the first time, part of the network of filaments thought to connect galaxies in a cosmic web. read more

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