The US Air Force is preparing to launch a X-37B mini robotic space plane on the Falcon 9 rocket in September – but its mission remains a mystery

“The upcoming mission – known as Orbital Test Vehicle-5 – is lifting off from Launch Complex 39A at Nasa’s Kennedy Space Centre in Florida. This is the first time a space plane has launched on a Falcon 9 rocket – yet we still do not know exactly what’s on board the spacecraft, or its mission.”

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