I can't stand it when popular articles quote spacecraft speeds in mph or km/h. It's supposed to be more relatable to laypeople, obviously, but it's not. What d

I can't stand it when popular articles quote spacecraft speeds in mph or km/h. It's supposed to be more relatable to laypeople, obviously, but it's not. What does hundreds of thousands of mph mean to me? Nothing; there's nothing in ordinary life to compare to. Miles (or km) per second, now that does create a picture. I also can vaguely recall the order of magnitude of earth orbital speed in mi/s, as well as the speed of light.