Now, some will say it's a cruel sport. It's too easy. It's like hunting elephant in a zoo. But I say: Go for it!"
Dan's a little busy trying to squirm out of his "Sun doesn't move" line of reasoning (if one can call it that).
However, if your only beef with what I've said so far is that you didn't like my thumb/lightsource example, simply substitute the better-known example of a Black Hole.
The Black Hole bends light, and that was my point in mentioning the earlier thumb/lightsource example in the first place.
Gravity bends Light easily. Light does not bend Gravity easily. Such a one-sided state of events is worth pondering.