This mysterious matter was predicted from Einstein's theory of special relativity, but physicists can't seem to find it!
A pulsar 25,000 light-years away is wobbling in a weird way. But Einstein's theory of general relativity predicted it more than a century ago.
"UniverseMachine" churns out millions of unique universes to study dark matter and the evolution of galaxies.
An International team of scientists finds evidence that Earth began recycling itself more than 3 billion years ago.
Are aliens using super powerful flashlights to get our attention? Astronomers think there's a chance they are.
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