John Grunsfeld, associate administrator for the Science Mission Directorate, NASA, speaks on a panel about the instruments selected to investigate Jupiter's moon, Europa, Tuesday, May 26, 2015 at NASA Headquarters in Washington, DC. In July 2014, NASA officials requested proposals for instruments that would fly onboard a spacecraft conducting approximately 45 flybys of Europa over a 3-4 year period. Launch of the mission will likely take place some time in 2022.

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