Live coverage: SpaceX launches 60 more Starlink satellites

SpaceX’s launch director halted a countdown Tuesday to replace a sensor on the upper stage of a Falcon 9 rocket set to blast off with the GovSat 1 communications craft, the product of a joint venture between the commercial satellite operator SES and the government of Luxembourg.

China’s second Long March 5 rocket fell short of orbit Sunday after lifting off from a spaceport in the southern Chinese province of Hainan, placing a cloud over the country’s plans to send a robotic sample return mission to the moon later this year.

SpaceX called off the planned launch of a Falcon 9 rocket Friday at Cape Canaveral, halting the countdown less than a minute before liftoff to allow time to perform additional ground system checkouts before the mission’s next launch opportunity no earlier than Sunday.