Mysterious X-37B Military Space Plane to Fly Again Next Month
by Mike Wall, Space.com Senior Writer | April 24, 2015 06:47pm ET



Artist's illustration of the U.S. Air Force's X-37B space plane in orbit. The mysterious spacecraft is scheduled to
launch on its fourth mission on May 20, 2015.
Credit: NASA Marshall Space Flight Center

The United States Air Force's X-37B space plane will launch on its fourth mystery mission next month.

The unmanned X-37B space plane, which looks like a miniature version of NASA's now-retired space shuttle orbiter, is scheduled to blast off atop a United Launch Alliance Atlas V rocket from Florida's Cape Canaveral Air Force Station on May 20.

"We are excited about our fourth X-37B mission," Randy Walden, director of the Air Force Rapid Capabilities Office, said in a statement. "With the demonstrated success of the first three missions, we’re able to shift our focus from initial checkouts of the vehicle to testing of experimental payloads."

The X-37B's payloads and specific activities are classified, so it's unclear exactly what the spacecraft does while zipping around the Earth. But Air Force officials have revealed a few clues about the upcoming mission.

"The Air Force Research Laboratory (AFRL), Space and Missile Systems Center (SMC) and the Air Force Rapid Capabilities Office (AFRCO) are investigating an experimental propulsion system on the X-37B on Mission 4," Capt. Chris Hoyler, an Air Force spokesman, told Space.com via email.

More:
http://www.space.com/29221-x37b-mili...h-mission.html