One of the most significant moments in the history of science may come after a new particle collider starts work this year beneath the Swiss-French border, according to a renowned physicist, Brian Greene.

Pulitzer-prize nominated author, Brian Greene, answers questions about the paradoxical nature of time, space and space-time.Astrobiology Magazine -- Brian Greene, Professor of Physics and Mathematics at Columbia University, is one of the world's leading string theorists.

NORMAL -- Time travel. A universe with nine or 10 dimensions instead of the three we're used to.

* THE FABRIC OF THE COSMOS: Space, Time and the Texture of Reality, by Brian Greene. Knopf. 544 pages. $28.95.

Catching a gravitational wave is not an easy business. You need a pipe stretching for two-and-a-half miles in a straight line, a laser beam and a lot of patience. The laser beam - bouncing up and down a vacuum inside the tube - is designed to measure the tube's length to fantastic accuracy.