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09/01/16

Universe steps on the gas

A puzzling mismatch is forcing astronomers to re-think how well they understand the expansion of the universe.

07/07/15

What is dark energy?

It’s everywhere. It will determine the fate of our universe. And we still have no idea what it is.

01/12/15

Mirror, mirror

After more than six years of grinding and polishing, the first-ever dual-surface mirror for a major telescope is complete.