小不董
第1楼2007/11/15
The findings were published online Sunday by the journal Nature Physics.
The first measurement of Einstein's time dilation took place in 1938, when US scientists used the Doppler effect -- the change in pitch when a sound and the person hearing it are moving apart or closer together -- as the measuring tool.
Einstein's theory of relativity has become the basis for innumerable science fiction tales, for it opens up the prospect of bending and distorting time.
If one of two identical twins were launched into space at very high speed, when he returned home, he would be younger than his earthbound twin.