Astronomers used to believe that all Type 1a supernovae were essentially the same brightness. That’s because they explode with the same amount of fuel. But now a supernova has been discovered that’s twice as bright as all the other Type 1a supernovae. This is a problem, since this kind of supernovae are used as standard candles, to determine distances across the Universe. Most recently, these supernovae have been used to calculate the mysterious force called dark energy that seems to be accelerating the expansion of the Universe.
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