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Telescopes and space missions

Telescopes and space missions

(Courtesy: NASA/JPL-Caltech)
07 May 2019
Taken from the May 2019 issue of Physics World.

By monitoring tiny changes to the Earth’s gravitational field, the GRACE satellites have been pinpointing the distribution of fresh water on our planet for almost two decades. But as Marric Stephens explains, a new follow-on mission is also helping with plans for a space-based gravitational-wave detector

Imagine the sea on a still day, calmer than you have ever seen it, with no wind to stir its surface,

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