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The largest shell is so big (4 light-years) it would stretch nearly all the way from our Sun to the next nearest star. The outbursts which created the shells seen by Hubble are estimated to be only 4,000 and 6,000 years old, respectively. Despite the mass loss by the star when it ejected this material, astronomers estimate the Pistol Star still has a mass of 100 times that of our Sun, and may ...
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