Per: http://news.yahoo.com/s/nm/20100215/sc_nm/us_physics_temperature
Hottest temperature ever heads science to Big Bang
Hottest temperature ever heads science to Big Bang
By Maggie Fox, Health and Science Editor Maggie Fox, Health And Science Editor – Mon Feb 15, 11:23 am ET
WASHINGTON (Reuters) – Scientists have created the hottest temperature ever in the lab -- 4 trillion degrees Celsius -- hot enough to break matter down into the kind of soup that existed microseconds after the birth of the universe.
They used a giant atom smasher at the U.S. Department of Energy's Brookhaven National Laboratory in New York to knock gold ions together to make the ultra-hot explosions -- which lasted only for milliseconds.