Eli5 If space is curved in many locations because of big objects and stuff, how do we know where an observed light originates then?

Question

If it passes in/by those gravitation fields, it must (I guess) also change direction at least slightly?

In: 43

Answer 1

Space is (mostly) flat. Ish. We think.

Anyway, it doesn’t bend all that much except in very close proximity to really massive objects, and the gravitational lensing we observe can be corrected for.

For example; relativity was actually proven by precise measurements of gravitational lensing of background stars caused by our own Sun.