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Air Force's X-37B Space Plane Lands in Florida After Record-Breaking Secret Mission

Space.com logo Space.com 5/8/2017 Mike Wall Space.com Senior Writer
The US X-37B Orbital Test Vehicle mission 4 after landing at NASA's Kennedy Space Center Shuttle Landing Facility May, 7 2017. According to the US Air Force, the re-entry spacecraft spent more than 700 days in space. The experimental X-37B, unmanned military space plane

The record-shattering mission of the U.S. Air Force's robotic X-37B space plane is finally over.

After circling Earth for an unprecedented 718 days, the X-37B touched down Sunday (May 7) at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida — the first landing at the SLF since the final space shuttle mission came back to Earth in July 2011.

"Today marks an incredibly exciting day for the 45th Space Wing as we continue to break barriers," Air Force Brig. Gen. Wayne Monteith, the 45th SW commander, said in a statement. "Our team has been preparing for this event for several years, and I am extremely proud to see our hard work and dedication culminate in today's safe and successful landing of the X-37B." [The Mysterious X-37B Space Plane: 6 Surprising Facts]

The just-ended mission, known as OTV-4 (Orbital Test Vehicle-4), was the fourth for the X-37B program. All four launched from Florida's Cape Canaveral Air Force Station, and the first three landed at Vandenberg Air Force Base in California. But Air Force officials have said they want to consolidate X-37B launch and touchdown operations on Florida's Space Coast, so today's landing might be the first of many at the SLF.  

"The hard work of the X-37B OTV team and the 45th Space Wing successfully demonstrated the flexibility and resolve necessary to continue the nation's advancement in space," Randy Walden, the director of the Air Force Rapid Capabilities Office, said in the same statement. "The ability to land, refurbish, and launch from the same location further enhances the OTV's ability to rapidly integrate and qualify new space technologies."

The Air Force is known to possess two X-37B space plane vehicles, both of which were built by Boeing. The 29-foot-long (8.8 meters) X-37B looks like NASA's now-retired space shuttle orbiter, only much smaller; indeed, two X-37Bs could fit inside a space shuttle's cavernous payload bay.

The X-37B launches vertically and comes back to Earth horizontally for a runway landing, as the space shuttle did.

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Most of the X-37B's payloads and activities are classified, leading to some speculation that the space plane could be a weapon of some sort, perhaps a disabler of enemy satellites. But Air Force officials have always strongly refuted that notion, stressing that the vehicle is simply testing technologies on orbit.  [The X-37B's Fourth Mystery Mission in Photos]

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"Technologies being tested in the program include advanced guidance, navigation and control; thermal-protection systems; avionics; high-temperature structures and seals; conformal, reusable insulation, lightweight electromechanical flight systems; and autonomous orbital flight, re-entry and landing," Capt. AnnMarie Annicelli, an Air Force spokeswoman, told Space.com via email in March.

"Also, 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," she said.

Each X-37B flight has been longer than the last. OTV-1 lifted off on April 22, 2010, and spent 224 days in space; OTV-2 launched on March 5, 2011, and orbited Earth for 468 days; and OTV-3 began on Dec. 11, 2012, and lasted 674 days. (OTV-4 lifted off on May 20, 2015.)

Though OTV-4 set an X-37B program record, the mission fell far short of the overall mark for longest spaceflight mission. Some Earth-observing satellites have operated for decades, and NASA's twin Voyager 1 and Voyager 2 probes are still sending data home, nearly 40 years after their 1977 launches.

Follow Mike Wall on Twitter @michaeldwall and Google+. Follow us @Spacedotcom, Facebook or Google+. Originally published on Space.com.


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