Top secret X-37B space plane to blast off this morning - and we still don’t know what it will do in orbit or when it will be back
X-37B drone will blast off on its fourth secret mission at 11:05 am ET
Theories range from it being a space bomber to destroying satellites
Flight will also test a system that makes satellites easy to manoeuvre
This is probably a small part of the vehicle’s true mission, say experts
One minute to go go go!