A new pair of spacecraft are preparing to launch into space on May 19

A new pair of spacecraft are preparing to launch into space on May 19:

A new pair of spacecraft are preparing to launch into space on May 19 to observe our planet’s ever-changing water cycle, ice sheets & crust. These twin GRACE-FO satellites will measure how water is distributed on the planet & how that changes each month.

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Check out @NASA’s Tweet: https://twitter.com/NASA/status/991035353137115136?s=09