Secretive U.S. Air Force Spacecraft Has Been Orbiting Earth for a Record 719 Days and We Don't Know Exactly What It's Doing Up There

Imagine spending 719 days orbiting the earth...that's exactly what this Air Force spacecraft just did and it's still going.
Published: 6:56 AM CDT August 27, 2019
Updated: 10:02 AM CDT August 27, 2019