What on Earth? S12E7: Nevada's Mystery Marking
- Aired: 2023-02-23
- Time: 21:00:00
- Runtime: 60 minutes
Overview
Satellite images capture an enormous X shape mysteriously carved with precision in the remote Nevada desert. Experts investigate a military emergency landing field linked to one of aviation history's most astonishing test programs, the X-15. It flew over six times the speed of sound and at altitudes over 62 miles high.