Why cant "forces" travel faster than light speed? As always, I'll start with a disclaimer that I know next to nothing about physics, just that I have an interest in the subject (actually, relativity kinda scares the hell out of me for some odd reason). Anyways, Im reading through this book called "The Elegant Universe" and the author is talking about the dilemma between relativity and Newtonian gravity. As I understand the concept, under the principles of relativity, nothing can travel faster than the speed of light as an objects mass will increase and meet up with an infinite resistance. However, why should this hold true for "forces" (i..e gravity, magnetism)? Is it because these forces are comprised of mass? Just wondering. Thanks.