SUMMARY: New research from the University of Michigan has determined that there's definitely an upper limit to the mass that stars can reach - between 120 and 200 times the mass of our own Sun. The team examined a wide range of stellar clusters, and determined the distribution of the mass of stars in those clusters. They couldn't find any stars above this 120-200 stellar mass limit. But this brings up a new mystery. Is this as big as stars get because they run out of material, or is there a fundamental limit in physics that stops them from getting any bigger?

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