To investigate a new form of matter not seen since the Big Bang, scientists are using a new experimental probe: collisions between two beams of copper ions. The use of intermediate size nuclei is expected to result in intermediate energy density - not as high as in earlier runs colliding two beams of gold ions at the Relativistic Heavy Ion Collider (RHIC), but more than was produced by colliding a beam of gold ions with much lighter deuterons.
If a universe explodes into existence, and no one is around to hear it, does it still make a sound? The answer, according to RHIC physicist John Cramer, is a resounding yes. You can listen to the reverberations the Big Bang sent ringing through the cosmos in a new sound file based on the cosmic microwave background that originated at the birth of time.