WD J133001.13+643523.7 would like to have a word, however. And that word is “chartreuse.”

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Look up at the sky on a clear night, and you'll see thousands of stars – about 6,000 or so. But that's only a tiny fraction of all the stars out there. The rest are too far away for us to see them. Yet astronomers like me have figured out how to estimate ...

Einstein's theory of relativity just got put to the test by the lightest binary neutron star system ever discovered.