Live coverage: Two Americans, one Russian launch to space station

Arianespace’s third Ariane 5 launch of the year was set liftoff Friday from Kourou, French Guiana, but an issue with a sensor on the rocket’s first stage liquid hydrogen tank caused officials to scrub the launch attempt. The Ariane 5 is poised to carry three U.S.-built commercial satellites into orbit, while testing a few rocket upgrades, including a modified fairing needed for the launch of the James Webb Space Telescope next year.

A solid-fueled small satellite launcher named Jielong 1 fired into orbit Saturday on its first flight from northwestern China, debuting a new rocket developed by a spinoff of China’s state-owned launch vehicle manufacturer using a “commercial business model.”

Two software errors detected after launch of a Boeing Starliner crew ship during an unpiloted test flight last December, one of which prevented a planned docking with the International Space Station, could have led to catastrophic failures had they not been caught and corrected in time, NASA said Friday.