This is the best summary I could come up with:

On Friday, Simola reported on social media and on SeeSat-L, a long-running online forum of satellite tracking enthusiasts, that he detected an unidentified object using a sky-watching camera.

"Congrats to Tomi Simola for locating the secret X-37B spaceplane," posted Jonathan McDowell, an astrophysicist and widely respected expert in spaceflight activity.

At that time, enthusiasts used information about the Falcon Heavy's launch trajectory and drop zones for the rocket's core booster and upper stage to estimate the orbit it would reach with the X-37B spaceplane.

It resembles a miniature version of NASA's retired space shuttle orbiter, with wings, deployable landing gear, and black thermal protection tiles to shield its belly from the scorching heat of reentry.

There is also a service module mounted to the back end of the spaceplane to accommodate additional experiments, payloads, and small satellites that can deploy in orbit to perform their own missions.

The secrecy surrounding the X-37B has sparked much speculation about its purpose, some of which centers on ideas that the spaceplane is part of a classified weapons platform in orbit.

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