Video: Progress launches and docks

SpaceX has delayed the launch of the SES 12 communications satellite until shortly after midnight Friday at Cape Canaveral, allowing teams additional time to complete pre-launch vehicle checks and wait for improved weather conditions. The launch, which was previously set for Thursday, is expected around 12:29 a.m. EDT (0429 GMT) Friday.

Three Chinese military satellites and a civilian data relay payload launched Thursday aboard a Long March 2C rocket.

SpaceX says engineers completed checks of the Falcon Heavy rocket, its satellite payloads, and ground systems at the Kennedy Space Center after a lightning strike on the launch pad’s tower Thursday night, part of a wave of severe weather that forced officials to delay the launch attempt.