system
Given the following post, respond as if you're commenting on Reddit:
human
How can there be no straight lines in space?

So I was doing higher maths in school (sixth form) and my other class mate told the teacher how he enjoys astrophysics and the teacher replies with a "do you?" And proceeded to tell us how there are no straight lines in space, so could reddit explain to me how or if this is true? It might have been that you can't travel in straight lines? I'm not sure but could someone please explain?
gpt
Astrophysicist here - it is not really correct to say there are no straight lines. It is very possible to have a line go radially out with zero curvature for as long as the human heart could desire. However space time is curved and thus even photons will curve their trajectories (according to the least action principle) but this doesn't really mean straight lines don't exist. Space is weird but it isn't that weird. Things are just very huge.