SpaceX launches US Air Force's secret space shuttle
Elon Musk-led space exploration startup SpaceX on Thursday successfully launched its Falcon 9 rocket carrying US Air Force's secret X-37B orbital test vehicle. The mission marks the 13th launch of the Falcon 9 rocket this year and fifth for the US X-37B orbital test vehicle. Interestingly, officials have not disclosed what the unmanned space shuttle does in the orbit.