““The same energy density that we reach today in electron-positron collisions pervaded the entire universe one ten-billionth of a second after the Big Bang. At that time, the universe was the size of our solar system today, and its temperature was one million billion (or 10^15) degrees Celsius. All over space the same processes happened that we observe today in the elecron-positron collisions we just described. The LEP machine in Geneva has permitted the detection of millions of such mini-Big Bang events-truly, it has been a machine for the exploration of the vacuum!””
