Video: Falcon 9 rocket test-fired at pad 39A (members only)

Assuming good weather and a smooth final few weeks on the International Space Station, astronauts Doug Hurley and Bob Behnken are scheduled to undock from the orbiting research outpost Aug. 1 and return to Earth the next day to wrap up a 64-day test flight of SpaceX’s Crew Dragon spaceship.

The successful launch and landing by the first stage of a SpaceX Falcon 9 rocket Monday was a significant step toward achieving reusability and, eventually, lowering launch costs, but turning that success into operational reality poses a significant challenge for company founder Elon Musk.

Rocket Lab’s first launch of the year lifted off Thursday at 7:27 p.m. EDT (2327 GMT) after a four-day delay to replace a video transmitter and wait for improved weather. The company’s Electron rocket launched from Mahia Peninsula on New Zealand’s North Island with a technology demonstration satellite for DARPA, the U.S. military research and development agency.