Gravity does not affect light, it affects the fabric of space around mass.
So, the light is still traveling in a straight line- but the line itself is in a curved space around the mass.
The same way gravity affects everything else. The earth is moving in a straight line too- but it moves around the sun only because it is in a path of distorted space that curves around the sun.
Interesting way to put it. Good post.
You lost me a bit. But I see your point regarding light in a straight line through “curved” space.
Assumptions: Our galaxy is moving in space. Our galaxy is rotating as it moves through space. Our solar system is in one arm of our spiral galaxy (in rotation). Our solar system is moving within that arm of our galaxy with our star being at the center of the movement. Then our planet is moving around our star. If observed from a stationary point in space (no idea how you could determine what that would be), how would our planet be observed as moving in a straight line. Could the distance our planet has traveled be measured from that observation?
Similarly, If light is observed from a single point in space, in a straight line, and the light travels along a curve in space, that we cannot see, how is the red shift affected as component of the distant the light travels before we see and measure it? We determine distance based on how far light has traveled at a constant speed. Does it not suppose that light traveling through curved space (gravity) would travel farther, and thus corrupt the data?