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Thanks for the replies, and the move. I'm all cleared up now. Thanks again!

" If an astronaut travels into space for six months at a substantial fraction of light speed and takes another six months to return to Earth, he would land in the future. While a year will have elapsed on the astronaut's clock, tens of thousands of years may have gone by on Earth, depending on how close to light speed the astronaut traveled. " How is this? Does our biological clock slow down during high speed? How is speed relative to time and duration? It seems that this may be assuming the existence of Einstein-Rosen bridges (or wormholes). If this is the case, would the speed of the wormhole be congruent to the ratio of Casimir energy to gravity? What, if any ability is created by this mechanism to slow down the duration of time inside of the said space capsule that the astronaut would be traveling in?