The US military is set to launch the secretive space plane once again on May 16th with a cargo full of experiments via unexplained-mysteries: The notoriously enigmatic vehicle, which looks a bit like a miniature version of NASA's retired Space Shuttles, was originally designed to repair satellites before NASA discontinued the project and passed it over to the US Department of Defense 16 years ago. Since then, it has launched on a series of increasingly lengthy missions - the most recent lasting a record-breaking 780 days - during which it has been reportedly testing 'experimental technologies'. Now for its upcoming sixth flight, it has been revealed that the X-37B will be carrying more experiments than ever before. One of these, which has been designed by NASA, will examine the effects of space radiation on seeds, while another, which has been designed by the US Naval Research Laboratory, will "transform solar power into radio-frequency microwave energy." It will also deploy FalconSat