Video: Orion launch replays

NASA’s top human spaceflight official says the maiden flight of the Space Launch System, a behemoth booster designed to loft astronauts on expeditions into deep space, will be delayed from November 2018 until some time in 2019, according to a report published by a U.S. government watchdog Thursday.

The pace of the European Space Agency’s development of a power and propulsion module for NASA’s Orion crew capsule will likely determine when an unpiloted test flight of the spaceship and its heavy-lift rocket will take off, NASA officials said last week.

A three-minute test flight Tuesday morning over Cape Canaveral will help ensure NASA’s Orion crew capsule — the vehicle being built to carry astronauts back to the moon — can safely escape from a catastrophic failure on launch.