GRATTIS
NASA selected for development a smallsat mission called GRATTIS to test new sensors for measuring the Earth's gravitational field. Credit: Univ. of Florida/Simon Barke

WASHINGTON — NASA has picked four Earth science mission proposals for further study while separately selecting a smaller Earth science technology demonstration mission for development.

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Jeff Foust writes about space policy, commercial space, and related topics for SpaceNews. He earned a Ph.D. in planetary sciences from the Massachusetts Institute of Technology and a bachelor’s degree with honors in geophysics and planetary science...