SpaceX launched the seventh test flight of its Starship rocket on Thursday, but lost communication with the upper stage of the rocket that continues on into space.The company’s webcast showed data stopped transmitting from Starship about nine minutes into the launch.

Elon Musk’s spaceflight company is continuing its work on the vehicle that could one day take people to the moon and eventually Mars.

SpaceX launched Starship on Thursday for a seventh test flight, after weather concerns pushed back an experiment that will feature the spacecraft’s first payload deployment test, and while it successfully caught the Super Heavy Booster, SpaceX lost communication with Starship shortly after.