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NASA Spacecraft Is Set To Get A Close Look At Jupiter's Moon

On Monday, the visit by NASA's Juno spacecraft will make the first close fly-by of Jupiter's moon Ganymede in more than 20 years. What are scientists hoping to learn?

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Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.