Watch a 4K video replay of Falcon Heavy’s static fire test (members only)

In the last few months, teams of SpaceX engineers working on the flat coastal plains of South Texas and in a nondescript industrial yard on Florida’s Space Coast have been building two futuristic-looking stainless steel rockets — or Starships — prototypes for a reusable vehicle the company claims could one day ferry people to Mars.

A computer-triggered abort halted the countdown of a Falcon 9 rocket Sunday at NASA’s Kennedy Space Center in Florida, pushing back the next mission in SpaceX’s launch surge until at least Monday.

China successfully launched a Gaofen optical observation satellite Sunday toward a perch more than 22,000 miles over the equator, where it will use an Earth-facing telescope to collect remote sensing images, Chinese state media said.