Taken from the May 2019 issue of Physics World. Members of the Institute of Physics can enjoy the full issue via the Physics World app.
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
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