What did the US military’s secret spaceplane do on its record-breaking mission?

A classified United States Space Force (USSF) spacecraft has landed back on Earth after spending a record 908 days in orbit. But what it did over our heads remains shrouded in mystery.

The unmanned X-37B spaceplane touched down at NASA’s Kennedy Space Station on Nov. 12 at 5:22 a.m. ET, completing the sixth mission it and another identical vehicle have completed since its maiden flight in 2010. Details of its activities during the record-breaking trips are scarce, but officials claim it conducted a number of science experiments about 249 miles (400 kilometers) above Earth.

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