SpaceX called off a launch attempt in Texas Monday for the Super Heavy booster and Starship launch vehicle, blaming a bad valve on the first stage. The next launch attempt for the world’s largest rocket is scheduled for Thursday, depending on weather and a fix for the valve problem.

An International Launch Services Proton rocket lifted off at 2137 GMT (4:37 p.m. EST) on Dec. 27 with the Astra 2G communications satellite, a new broadcasting platform owned by SES to beam television and broadband services to Europe, Africa and the Middle East.

A Northrop Grumman Antares rocket launch April 17 from Virginia’s Eastern Shore marked the start of the 11th Cygnus resupply mission to the International Space Station.