The X-37B is an Air Force satellite that looks like a mini Space Shuttle.
We don't know much more than that.
It was launched, went into orbit, orbited the Earth for two years, and just recently returned to the Terra Firma from whence it came.
What did it do for those two years? Hell if I know.
X-37B: The Air Force's Mysterious Space Plane (with informational video)
Back with a bang! Top secret Air Force X-37B lands with a sonic boom after spending two YEARS in space but they still won't say what it was doing up there
|The X-37B, about which little is known (publicly)|