[Qwinn]

"All of the fundamental forces are considered Exchange Forces. In other words the force involves an exchange of one or more particles."

*arches eyebrow*

Gravity is considered to involve an exchange of particles now? That seems pretty darn gutsy, considering I've never heard of any evidence for that. Or did I miss a really REALLY important memo?

Qwinn

[RadioAstronomer]

Yes. It is called the Graviton. Look here:

http://www.lbl.gov/abc/wallchart/teachersguide/pdf/Ch04-FundamentalInter%20doc.pdf