For the second time since it launched, amateur astronomers have failed to find the X-37B in its orbit.
Astronomers speculate that one of the possibility is the space plane is preparing to land after 173 days in orbit.
Aviation News
For the second time since it launched, amateur astronomers have failed to find the X-37B in its orbit.
Astronomers speculate that one of the possibility is the space plane is preparing to land after 173 days in orbit.