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A Universe Full of SurprisesAwake!—2009 | August
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In 1998, researchers analyzing light from a special kind of supernova, or exploding star, found evidence that the expansion of the universe is actually accelerating!b
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A Universe Full of SurprisesAwake!—2009 | August
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b The exploding stars are called type 1a supernovas, and they may shine as brightly as a billion suns for a short time. Astronomers use these supernovas as a standard for measurement.
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