Stars going supernova are among the most powerful events in nature. Light from such a blast can be seen completely across the universe. Now, astronomers believe it might someday be possible to predict when a star might blow.
They studied a star that went supernova in 2010 and discovered that 40 days before the main event, a much smaller explosion occurred. They think such smaller blasts could be tips that the supernova event is imminent.
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