Seeing double could help resolve dispute about how fast the universe is expanding: Astronomers uses split images of quasars to produce a new estimate of the Hubble constant

Seeing double could help resolve dispute about how fast the universe is expanding: Astronomers uses split images of quasars to produce a new estimate of the Hubble constant

How fast the universe is expanding has been puzzling astronomers for almost a century. Different studies keep coming up with different answers -- which has some researchers wondering if they've overlooked a key mechanism in the machinery that drives the cosmos. Now, by pioneering a new way to measure how quickly the cosmos is expanding, astronomers have taken a step toward resolving the debate.

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