I'm with subbie on the topic of "ignorance on display" here - and not only by alter2ego!
I don't think much of that Thinkquest quote, can't you find a more authoritative source than one "by students for students" to learn from? The statement "Since the Sun is so massive, the planets can't move the Sun with their gravity and are forced to move around the Sun" is nonsense. While I can see what they're trying to say, any of my first-years putting that sort of rubbish down on paper would be asked to seriously reconsider his future as a scientist.
Tell me, a2e, according to your understanding, if the Earth's "gravity" (presumably the magnitude of its gravitational field at the surface) was different from its current value, do you think that its orbit around the sun would be significantly different?
Oh, and while you're at it, let's have your thoughts on how an attractive force can stop things from bashing into each other....
Edited by fizz57102, : rewritten concluding statement