The current OTV-4 mission of the X-37B space plane has cross the 600 days mark and if it still orbits the Earth after Mar. 23, it will break the previous record set by OTV-3.
By USAF [Public domain], via Wikimedia Commons
Aviation News
The current OTV-4 mission of the X-37B space plane has cross the 600 days mark and if it still orbits the Earth after Mar. 23, it will break the previous record set by OTV-3.
By USAF [Public domain], via Wikimedia Commons