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Rick Nybakken, Juno Project Manager, holds a model of the Juno spacecraft discusses the orbit the Juno spacecraft will take around Jupiter during a briefing at the Jet Propulsion Laboratory in Pasadena, on Monday, July 4, 2016. The solar-powered spacecraft is on it's way toward Jupiter for the closest encounter with the biggest planet in our solar system. NASA's Juno spacecraft will fire its main rocket engine late Monday to slow itself down from a speed of 150,000 mph (250,000 kph) and slip into orbit around Jupiter. (AP Photo/Richard Vogel)