The U.S. Air Forces X-37B Space Plane has been orbiting the Earth for 719 consecutive days. What is it doing, and what is its mission goal? - Quora
![US military's mysterious X-37B space plane passes 500 days in orbit, but we still have no clue what it's actually doing up there | Extremetech US military's mysterious X-37B space plane passes 500 days in orbit, but we still have no clue what it's actually doing up there | Extremetech](https://i.extremetech.com/imagery/content-types/00YWb3a2MXlWreUmnUoeQCM/images-5.jpg)
US military's mysterious X-37B space plane passes 500 days in orbit, but we still have no clue what it's actually doing up there | Extremetech
US Military's 'Most Secretive Craft' Has Been 'Flying Non-Stop' For Over Two Years & Has No Plans To Land
![File:The X-37B OTV is inspected after landing at Vandenberg Air Force Base, California.jpg - Wikipedia File:The X-37B OTV is inspected after landing at Vandenberg Air Force Base, California.jpg - Wikipedia](https://upload.wikimedia.org/wikipedia/commons/9/92/The_X-37B_OTV_is_inspected_after_landing_at_Vandenberg_Air_Force_Base%2C_California.jpg)