3 ms·

I mean, car/jet might as well be a horse compared to c.

• wlesieutre 9y ago
  The Juno probe hit 90,000 mph on a gravitational slingshot around Earth. That's about 0.00013 c.
  • Retric 9y ago
    Energy wise you need ~240,000,000x the energy to hit 0.5 C, so still a very long way. Also, g forces are real problem for over land travel. In space you can eventually almost hit C by aiming for a black hole. But to stay on land you start hitting negative g's due to curvature and or high g forces to start and stop.
    • wlesieutre 9y ago
      Parker space probe should set a new record at 430,000 mph on its closest approach around the sun!