WHAT’S IT UP TO?
Despite flying six missions, its true purpose remains a mystery. Some possibilities include surveillance of Earth’s surface and deploying spy satellites, though nothing has been confirmed. More out-there theories have been proposed, such as the notion the X-37B could be a spacebased bomber, a vehicle for spying on the Chinese space station or a means for the US military to interfere with other countries’ satellites. Experts have splashed cold water on all these ideas, saying they would require large amounts of fuel or would be too easy to trace back to the US military.