SpaceX Falcon Heavy launches X-37B plane, one of the US military’s most fascinating secrets

FLORIDA (CNN) — SpaceX’s hulking Falcon Heavy rocket returned to the skies Thursday evening, and this time it launched a mysterious spacecraft for the US military that will carry out cutting-edge research.

The rocket lifted off from NASA’s Kennedy Space Center in Florida at 8:07 p.m. ET, carrying the military’s X-37B space plane — which is uncrewed and operates autonomously — to unprecedented altitudes. The launch streamed live on SpaceX’s website. The side boosters returned to Earth and safely touched down.

It is not clear, however, exactly where the space plane is going.

The X-37B’s activities in space have long been the subject of fascination and speculation in the space community as amateur enthusiasts race to track its whereabouts and share theories about its activities.

Resembling a miniature NASA space shuttle with the windows blacked out, the reusable and fully autonomous X-37B has been known to carry out research on concepts such as relaying solar energy from space for use back on Earth and studying the effects of radiation on seeds used to grow food.

And this mission — the seventh trip to space for an X-37B plane — promises to be even more intriguing than earlier flights.

This launch marked the first time the space plane has hitched a ride on a SpaceX Falcon Heavy, one of the most powerful operational rockets in the world.

Previously, the X-37B has launched on the SpaceX Falcon 9 vehicle and the Atlas V rocket built by United Launch Alliance, a joint venture between Lockheed Martin and Boeing.

The Falcon Heavy produces more thrust than both of those rockets combined.

The launch via the Falcon Heavy could indicate that X-37B is destined for more distant orbits, perhaps even to the moon or Mars, suggested Paul Graziani, CEO of COMSPOC, a company dedicated to tracking objects in space.

If it does travel much deeper into the cosmos than earlier flights, it could be far more difficult for sky-gazers on Earth to determine where the vehicle is.

If the military doesn’t want people to track the X-37B, Graziani added, the vehicle can be hidden in the glare of the sun or by various other means — including changing its position often. The X-37B has already proven on previous flights that it’s capable of making multiple maneuvers in space.

COMSPOC will attempt to search for the vehicle if the spacecraft winds up in geosynchronous orbit, which lies about 22,400 miles (36,000 kilometers) from Earth and is where most massive communications satellites operate. Geosynchronous orbit is where the company focuses its sensors for tracking satellites, said Graziani and Bob Hall, COMSPOC’s director of operations integration.

“I think it’s one of the most interesting things that’s happened in space in a long time, whatever it’s going to do,” Graziani said of the X-37B launch.

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