On May 7, the Kennedy Space Center in Cape Canaveral, Florida got a loud surprise. One of the Air Force's two secret X-37B space planes announced its re-entry to Earth with a loud sonic boom.
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The US Air Force's top secret space plane lands after 2 years in orbit — and no one knows why
What does the Air Force need with secret space planes?
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The plane is part of the Air Force's X-37 program. Not much is known about this program except that the Air Force has launched four missions since 2010.
Moreover, the plane that returned from orbit on May 7 stayed in space longer than any of the previous three missions. What are those space planes doing up in space?
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