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John William Tuohy lives in Washington DC

There’s a 250 light-year hole in the center of emission nebula N44 and astronomers aren’t sure why.



There’s a 250 light-year hole in the center of emission nebula N44 and astronomers aren’t sure why. It could be that particle winds from massive stars are pushing out the gas. Perhaps a more compelling explanation though, based on the detection of X-ray emitting gas, is that supernova explosions carved out this cavern

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