- cross-posted to:
- futurology@futurology.today
- technology@lemmit.online
- cross-posted to:
- futurology@futurology.today
- technology@lemmit.online
SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making i…::undefined
They’ll test it on the ground and flying slowly first before going fast to make sure it’s safe enough.