Alfred Einstead wrote:

wrote:
Not quite as right -- the earth moves through curved spacetime, not
just curved space.

Things don't move through spacetime. They ARE in spacetime;
particularly: they are worldlines.

Motion is 3-dimensional language. There is no motion in 4
dimensions.



Thank you for saying that. I never thought that I'd see the day when I
wanted to tell Carlip to get a real concept.