Secret space plane, solar sail launch aboard Atlas V
May 21, 2015  00:08
The Air Force's mysterious space plane is back above the Earth -- along with Bill Nye's solar sail.

A United Launch Alliance Atlas V lifted off Wednesday morning from Florida's Cape Canaveral Air Force Station with sundry cargo, including the Air Force's X-37B Orbital Test Vehicle.

The X-37B, a reusable spacecraft now on its fourth mission, is expected to reach low-Earth orbit after riding atop the Atlas rocket's second stage, called the Centaur.

The Centaur, after releasing the spacecraft, will change altitude and release its other cargo -- 10 CubeSats, or small satellites.

One of the CubeSats on this flight is LightSail, a solar sail owned by the Planetary Society, a nonprofit space advocacy group led by CEO Bill Nye, the science educator and former TV host.

The X-37B looks like a small space shuttle, but it doesn't have a crew. It can stay in space for years at a time. The last mission ended in October 2014 after 674 days in orbit.

The plane is controlled like a drone and lands like an airplane. The media nicknamed it the "secret space plane" because the Air Force won't say much about what it does once it gets into space.

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