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Dec15-11, 09:23 PM
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The Jeans mass limits the 'birth' mass of stars [which varies for Pop 1, II and III stars]. The mass limit for coalescence of stars is not well known. Stellar collisions are so extraordinarily rare in the univerve we have insufficient observational data to model the upper limit for these events. One thing, however, is well established, enormously massive stars simply do not live long enough to accrete a large amount of additional mass. Stars more than 100 solar masses only live for tens of millions of years, as compared to the sun, which has a life expectancy of around ten billion years.