"I WANNA GO FAST!" —RICKY BOBBY, TALLADEGA NIGHTS
"YOU WANT SPEED? WE'VE GOT IT IN THE COSMOS.
On Earth, if you live in the midlatitudes, Earth's rotation is carrying you and the atmosphere you breathe sideways—due east—at about 800 mph. If you're an equator dweller, that speed is 1000 mph. Santa, on the North Pole, has no sideways motion at all. His cottage simply pirouettes once per day.
Problem is, our planet rotates so smoothly that you don't even feel it. What fun is that?
The rotating Earth also orbits the sun, in a nearly circular path, at about 67,000 mph. It moves so smoothly through space, you don't feel that, either. What fun is that?
The sun, with its formidable gravitational force, drags all its planets, moons, comets, and…