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The remarkable spectacle, known as the CG 4 cometary globule, is situated 1,300 light years from Earth.
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Dark energy could be the key to understanding a cyclical universe that contracts and expands over and over again.
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A controversial new study has suggested that this hypothetical form of energy may not actually exist at all.
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Scientists have suggested that most of the universe may be made up of a 'dark fluid' with a negative mass.
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The mysterious dark energy that permeates the universe may be causing dark matter to evaporate.