Question

As light from a star spreads out and weakens, do gaps form between the photons?

Answer 1

Not exactly what is meant by this question, but

I ∝ n h ν intensity at a point is proportional to the number of photons received

E ∝ 1 / R^2 illuminance at a point is proportional to 1 / R^2

So the number of photons received at any any point is inversely proportional to the number of photons reaching that point

So as one moves away from the source the number of photons received at that point will decreases