So if I drop an apple, we can consider the ground accelerating upwards and the apple still. And the radius of the earth doesn't change due to space time being curved. I'm having a hard time conceptualizing this. Is it analogous to a classically orbiting object? Classically, under simplfying assumptions, the Moon is accelerating towards the center of the Earth, yet it's radial position realitive to the center is unchanged. This is similar to the ground accelerating up, but radial position doesn't change. Except there are two differences, the apple meets the ground, and there is no rotation, so there is something wrong with this analogy.