America’s next Mars rover, a $2.1 billion nuclear-powered vehicle to search for evidence that life once existed there, will be launched to the Red Planet in the summer of 2020 by a powerful Atlas 5 rocket.

SpaceX launched a Falcon 9 rocket at 3:01 p.m. EDT (1901 GMT) Tuesday from NASA’s Kennedy Space Center in Florida, carrying 60 more Starlink satellites into orbit. SpaceX successfully landed the Falcon 9 booster on a drone ship offshore.

SpaceX’s next Falcon 9 rocket arrived at Kennedy Space Center’s pad 39A on Thursday for a hold-down engine firing ahead of launch next week with the U.S. Air Force’s X-37B spaceplane. The brief engine ignition occurred at 4:30 p.m. EDT (2030 GMT).