In the late 1990s, astronomers discovered something mysterious pushing galaxies apart faster than gravity pulls them together. It seemed like every little bit of space had some amount of energy that spread it away from every other little bit of space, and that strange pushing came to be known as 'dark energy' - dark, because no one knows what it is.
And now a group of physicists have shown that dark energy could probably be explained - as long as we’re willing to give up a fundamental piece of our understanding of light...
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