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All four of the reaction wheels installed onto NASA's Europa Clipper are visible in this photo, which was shot from underneath the main body of the spacecraft while it is being assembled at the agency's Jet Propulsion Laboratory in Southern California. The spacecraft is set to launch in October 2024 and will head toward Jupiter's moon Europa, where it will collect science observations while flying by the icy moon dozens of times. During its journey through deep space and its flybys of Europa, the spacecraft's reaction wheels rotate the orbiter so its antennas can communicate with Earth and so…
