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Telescopes and space missions

Telescopes and space missions

Distance between spacecraft measured at the atomic scale

23 Jul 2019 Hamish Johnston
GRACE FO
Test rack: a GRACE-FO spacecraft being tested in Germany prior to launch. (Courtesy: Airbus DS GmbH/A Ruttloff)
A laser ranging interferometer (LRI) has been used to measure changes as small as 200 pm in the dis

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