I was always wondering if there is a way of distinguishing a straight line in a ...

		edna314 on Oct 19, 2020 \| parent \| context \| favorite \| on: Gravity is not a force – free-fall parabolas are s... I was always wondering if there is a way of distinguishing a straight line in a curved space from a curved line in a flat space, given that you cannot 'look' at space time from the outside. Would that be possible?

The usual suspects; lasers and mirrors. That's how gravitational waves were detected.