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Can stars become only so big? Stars may not be able to grow bigger than about 150 times the mass of our Sun according to an astronomer in the US. Donald Figer of the Space Telescope Science Institute in Maryland reached this conclusion after measuring the masses of stars in the nearby "Arches" stellar cluster (Nature 434 192). The result is the first direct measurement of the upper mass limit for stars. At present there is no accepted upper mass limit for stars.
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