Cosmology
3 questions
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What causes fast radio bursts?
Millisecond flashes of radio waves reach us from distant galaxies. Some come from magnetars — but do all of them?
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What is dark matter made of?
Most of the matter in the universe gives off no light and has never been caught by a detector. What is it?
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Why is there more matter than antimatter?
The Big Bang should have made equal amounts of both, and they should have annihilated. Something tipped the balance.