Here's everything we know about the mysterious Air Force plane that just landed after 2 years in space
Christopher Woody
The US military's X-37B space plane landed at NASA's Kennedy Space Center on Sunday, ending its record-breaking 718-day orbit with a sonic boom during its first landing in Florida.
The US Air Force has two X-37B Orbital Test Vehicles, which it calls its "newest and most advanced reentry spacecraft."
http://www.businessinsider.com/details-about-air-force-space-plane-that-spent-2-years-in-space-2017-5
