Staff Sgt. Adam Shanks/US Space Force
- US Space Force is teaming up with SpaceX to launch its X-37B spaceplane on Sunday.
- The vehicle carries secretive cargo and can fly in orbit for hundreds of days at a time.
- The spaceplane will launch atop SpaceX's Falcon Heavy, suggesting it will go higher than before.
The US Space Force's top-secret X-37B spaceplane is gearing up to launch on board a SpaceX rocket this weekend.
The pilotless vehicle is scheduled to launch from the Kennedy Space Center in Florida on Sunday 10th December, starting at around 8:14 p.m. ET, per Space.com.