Does light uses space fabric to travel?
2 Answers
YES.
Explanation:
We know this because around planets light follows a curved line. But we also know that photons have no mass and they don't affected from gravitational force. So we must ask, why they follow a curved path? It is because gravitation has a distruptive effect on space-time. Therefore, light must be travelling through space fabric.
Just because of the same reason light get sucked into black holes. (Black holes have a huge mass & space-time distruped too much so light cannot escape)
Light follows geodesics in four dimensional spacetime.
Explanation:
We know that the universe consists of four dimensional spacetime. There are three dimensions of space and one of time. We are constantly moving from one point in space time to another.
There may be more dimensions, but the theories are not sufficiently understood.
Mass and energy cause spacetime to curve. Curved spacetime manifests itself as gravity. Gravity is not a force, it is a consequence of the curvature of spacetime.
Light travels in straight lines. These are called geodesics in four dimensions. If spacetime is curved, light has to follow the curvature.
One way to look at spacetime is that it is a four dimensional curved surface. Light has to follow the contours of this surface and hence can be said to use the fabric of space (and time).
