About 165 years ago, Eta Carinae mysteriously became the second brightest star in the sky. In 20 years, after ejecting more mass than our sun, it unexpectedly faded. N. Smith / J.A. Morse (U. Colorado) et al. / NASASupernova Countdown: Giant Star Could Explode Any Day Now -- Time
When the sun finally dies some 5 billion years from now, the end will come quietly, the conclusion of a long, uneventful life. Our star will, in a sense, go flabby, swelling first, releasing its outer layers into space and finally shrinking into the stellar corpse known as a white dwarf.
Things will play out quite differently for a supermassive star like Eta Carinae, which lies 7,500 light-years from Earth. Weighing at least a hundred times as much as our sun, it will go out more like an adolescent suicide bomber, blazing through its nuclear fuel in a mere couple of million years and exploding as a supernova, a blast so violent that its flash will briefly outshine the entire Milky Way. The corpse this kind of cosmic detonation leaves behind is a black hole.
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