SpaceX is launching its Falcon Heavy rocket Thursday night, sending the mysterious, uncrewed military spacecraft, the X-37B space plane, to orbit.

The USSF-52 mission is scheduled to lift off from NASA's Kennedy Space Center in Florida at 8:07 p.m. and will stream live on SpaceX's website.

The spacecraft is launching on a SpaceX Falcon Heavy rocket for the first time.

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Although it's "top secret," a press release says there is a wide range of testing and experimentation objectives, including "operating the reusable spaceplane in new orbital regimes, experimenting with future space domain awareness technologies, and investigating the radiation effects on materials provided by NASA."