Launching the sixth mission of the U.S. military’s super-secret X-37B spaceplane program, a United Launch Alliance Atlas 5 rocket lifted off Sunday morning from Cape Canaveral and successfully delivered its clandestine cargo to orbit.

Learn more about the United Launch Alliance Delta 4-Heavy rocket as it prepares to perform the classified NROL-37 mission for the National Reconnaissance Office,

Space missions dispatched into the solar system often have journeys lasting years before reaching a scientific payoff, but NASA’s Parker Solar Probe launched last weekend on a speedy departure from planet Earth is already getting ready to sweep closer to the sun than any spacecraft in history during a flyby later this year.