Callisto and Ganymede are among the biggest moons in the solar system. NASA’s JUICE mission will reveal some of their secrets.
—radiation that can fry spacecraft electrics and human explorers alike. “If humanity is to build a base on one of the Jupiter moons, Callisto would be by far the first choice,” Sheppard says. “It could be the gateway moon to the outer solar system.”
This image of the Jovian moon Ganymede was obtained by the JunoCam imager aboard NASA’s Juno spacecraft during its June 7, 2021, flyby of the icy moon. At the time of closest approach, Juno was within 645 miles of its surface, closer to Jupiter’s largest moon than any other spacecraft has come in more than two decades., a professor of geology, physics and astronomy at Wheaton College, says he’s most excited about the Ganymede leg of the mission.
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