The X-37B landed at NASA's Kennedy Space Center in Florida early Sunday. The Air Force is mum about what the plane did in orbit after launching aboard a SpaceX rocket in 2017. The 780-day mission sets a new endurance record for the reusable test vehicle.
It looks like a space shuttle but is one-fourth the size at 29 feet.

https://phys.org/news/2019-10-air-mystery-space-plane-year.html