3 ms·

How do you define "hypersonic" in a vacuum?

• conqueso 4y ago
  Ha! Greater than 0 m/s I suppose - so still technically accurate :-P
• MisterTea 4y ago
  >1715 m/s same as in air but without the air.
• dredmorbius 4y ago
  In space, nobody can year you go transsonic...