NASA scientists John Grunsfeld, Jim Green, and Curt Niebur (left to right) speak at NASA Headquarters in Washington, D. C., on a 26 May panel about instruments selected to investigate Jupiter's moon Europa. In July 2014, NASA officials requested proposals for instruments to fly aboard a spacecraft conducting approximately 45 flybys of Europa over roughly a 3-year period. Credit: NASA/Aubrey Gemignani
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