Bear with me here...

Let's use the rubber sheet and bowling ball analogy for sake of simplicity.
The bowling ball is the sun, and it's bending of the rubber sheet,
represents the effect it's gravitational waves have on space. Now we drop a
baseball on the sheet, and we'll call it Jupter. Now we have a second
stretch on the sheet. Now let's add the other planets, the moons, the
asteroid belt, some comets, some random heavy objects, planet x, etc.

Our sheet is now going to be bent, stretched and mangled in many directions.
If a beam of light traveling space enters this mess, it can? would? be bent
in potentially many directions. It's speed would be affected by the gravity
in the area correct?

How then can we be sure where it came from?
How can we be sure of it's true speed?

BV.