Just how humungous can a star be? One more massive than any other we know has been has been identified in a nearby galaxy. At more than 250 times the mass of the sun, it may one day explode in an exotic blast that involves the creation of antimatter.
Named R136a1, the star sits toward the centre of RMC 137a, a crowded cluster of hot young stars some 165,000 light years away in the Large Magellenic Cloud, one of the Milky Way's nearest galactic neighbours.
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