NASA's TESS exoplanet space telescope, whose launch was initially delayed, is successfully launched from Cape Canaveral Air Force Station by SpaceX on a Falcon 9 rocket. The first stage of the rocket successfully landed on SpaceX's autonomous spaceport drone ship in the Atlantic Ocean.
President Trump nominates Oklahoma congressman Jim Bridenstine, member of the House Committee on Science, Space, and Technology, to be Administrator of the National Aeronautics and Space Administration.
NASA observes the asteroid YU 55 as it makes a close Earth flyby, passing within 0.85 lunar distances (about 201,700 miles) of the Earth. YU 55 is approximately 400 m across, and is the largest asteroid to make a close pass since 1976.