CAPE CANAVERAL, Fla.-- The Space Force has launched the military's mystery space plane again, this time with an extra load of science experiments.
The X-37B rocketed toward orbit Sunday morning from Cape Canaveral, Florida, a day late because of bad weather.
It's the sixth flight of an X-37B, which resembles a mini shuttle and operates remotely.
Officials aren't saying how long the spacecraft will remain in orbit.
The previous mission lasted a record two years.
The winged spacecraft resembles NASA's old shuttles, but is considerably smaller at 29 feet long.
The one just launched features an extra compartment for experiments.
The Air Force has two of these reusable space planes.