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An engineer at NASA's Jet Propulsion Laboratory in Southern California inspects the gamma ray and neutron spectrometer instrument as it is integrated into the agency's Psyche spacecraft on Aug. 23, 2021. Psyche, set to launch in August 2022, will investigate a metal-rich asteroid of the same name, which lies in the main asteroid belt between Mars and Jupiter. Scientists believe the asteroid could be part or all of the iron-rich interior of an early planetary building block that was stripped of its outer rocky shell as it repeatedly collided with other large bodies during the early formation o…
