4 ms·
> General relativity says that you can't tell the difference between being unaccelerated, and being in free fall. Just to be clear, GR only says this for a ver
by thechao 3y ago
> General relativity says that you can't tell the difference between being unaccelerated, and being in free fall.
Just to be clear, GR only says this for a very specific case, and a very specific observer. In fact, one of the easier exercises when first learning how to work with metrics is to show how to measure the difference.