30 October 2017
There's a giant "ruler" hidden among millions of galaxies in the universe. With it, scientists can measure how fast the universe is expanding. This will help them explore dark energy, the mysterious power behind cosmic expansion, and so speculate on the universe's destiny.
With this ruler, Chinese astronomers recently succeeded in reconstructing the evolution history of dark energy based on the observation of over a million galaxies. The research shows that dark energy is dynamic.
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