Live coverage: NASA confirms successful first flight of Mars helicopter

Astra was gearing up for the first orbital test flight of its small satellite launcher, named Rocket 3.0, from Alaska on Monday, but officials scrubbed the launch after detecting a problem with a guidance, navigation and control system in the final minute of the countdown. Poor weather at the launch site also prevented liftoff over the weekend on the first of two missions under the auspices of DARPA’s Launch Challenge.

SpaceX’s Crew Dragon spacecraft, designed to ferry astronauts to and from the International Space Station, fired into orbit on top of a Falcon 9 rocket Saturday from NASA’s Kennedy Space Center in Florida.

NASA Administrator Jim Bridenstine on Thursday urged space enthusiasts not to travel to the Kennedy Space Center next month to view the first launch of astronauts from the Florida spaceport since 2011, and asked people to instead watch the launch on television or online.