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Deep Space Atomic Clock
The Deep Space Atomic Clock, or DSAC, was a technology demonstration of a small, ultra-precise, mercury-ion atomic clock launched into Earth orbit to test its potential as a next-generation tool for spacecraft navigation, radio science, and global positioning systems. .
Launch date: June 25, 2019
The Gravity Recovery and Interior Laboratory, or GRAIL, mission was designed to create the most accurate gravitational map of the moon to date, which when combined with topographic data, can provide insight into the moon's internal structure, composition and evolution. .
Launch date: Sept. 10, 2011