Question

What may be discovered or proved as a result of gravitational waves now being confirmed?

Answer 1

We can now prove the existence of graviton and determine the distances between bodies (as the universe is expanding) correctly, like at which rate what is going away and coming together.
It also suggest that a time machine can be possible, not truly possible.

Answer 2

Answer:

Since LIGO's first detection, we've gained unexpected insight into the cosmos. That's because gravitational waves are a new way of “seeing” what happens in space: We can now detect events that would otherwise leave little to no observable light, like black hole collisions.