- cross-posted to:
- futurology@futurology.today
- cross-posted to:
- futurology@futurology.today
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
- Ghyste@sh.itjust.worksEnglish7·1 year ago