The mysterious, unmanned X-37B is scheduled to blast off into spacethis Saturday, May 16, from the Cape Canaveral Launch Complex 41. Strapped to a United Launch Alliance (ULA) Atlas V rocket, the robotic spacecraft will fly on its sixth classified mission. Weather permitting, SpaceXwill follow less than 24 hours later with the launch of a Falcon 9 rocket carrying a payload of 60 Starlink satellites.