Live coverage: SpaceX Falcon Heavy launches NASA’s Psyche on mission to a metal asteroid

The launch of five commercial Iridium message relay satellites and a pair of U.S.-German orbiting geophysics probes on a Falcon 9 rocket from California has been delayed three days to May 22, and a week-long schedule slip to May 31 is expected for the next SpaceX flight from Cape Canaveral with an SES communications payload.

SpaceX’s first full-size stainless steel Starship test vehicle stands some 164 feet tall and measures wider than the cabin of a Boeing 747 jumbo jet. If Elon Musk has his way, it will fly to an altitude of 65,000 feet before the end of the year.

In a significant milestone preparing for liftoff of the world’s most powerful rocket, SpaceX test-fired 31 of the booster’s 33 methane-fueled engines Thursday in South Texas as the company eyes a launch attempt as soon as March.