Mysterious X-37B plane lands after secret two-year mission

The US has landed its experimental X-37B plane in Florida, bringing to an end a two-year mission that is a complete secret.

The plane — which can fly itself and looks like a small space shuttle — landed over the weekend at Cape Canaveral, bring to an end a flight that began in May 2015. But the US Air Force didn’t reveal what it had been doing in the air or why it had come back down.

Conspiracy theorists have suggested that the plane could be testing a new kind of satellite weapon, or conducting surveillance. But there has been no official clarification of what it does during its long missions.

The X-37B, one of two in the Air Force fleet, conducted unspecified experiments for more than 700 days while in orbit. It was the fourth and lengthiest mission so far for the secretive program, managed by the Air Force Rapid Capabilities Office.

Where has this US space plane been for almost two years?

The orbiters “perform risk reduction, experimentation and concept-of-operations development for reusable space vehicle technologies,” the Air Force has said without providing details. The cost of the program is also classified.

The Secure World Foundation, a nonprofit group promoting the peaceful exploration of space, says the secrecy surrounding the X-37Bsuggests the presence of intelligence-related hardware being tested or evaluated aboard the craft.

The vehicles are 29 feet long and have a wingspan of 15 feet, making them about one quarter of the size of the National Aeronautics and Space Administration’s now-retired space shuttles.

The X-37B, also known as Orbital Test Vehicle, or OTV, first flew in April 2010 and returned after eight months. A second mission launched in March 2011 and lasted 15 months, while a third took flight in December 2012 and returned after 22 months.

Sunday’s landing was the X-37B’s first in Florida. The three previous landings took place at Vandenberg Air Force Base in California. The Air Force relocated the program in 2014, taking over two of NASA’s former shuttle-processing hangars.

The Air Force intends to launch the fifth X-37B mission from Cape Canaveral Air Force Station, located just south of the Kennedy Space Center, later this year.

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