Big Bang machine ready to go

GENEVA - It has been called an Alice in Wonderland investigation into the makeup of the universe - or dangerous tampering with nature that could spell doomsday.

Whatever the case, the most powerful atom-smasher ever built comes online Wednesday, eagerly anticipated by scientists worldwide who have awaited this moment for two decades.

The multibillion-dollar Large Hadron Collider will explore the tiniest particles and come ever closer to reenacting the Big Bang, the theory that a colossal explosion created the universe.

The machine at CERN, the European Organization for Nuclear Research, promises scientists a closer look at the makeup of matter, filling in gaps in knowledge or possibly reshaping theories.

The first beams of protons will be fired around the 27-kilometre tunnel to test the controlling strength of the world's largest superconducting magnets. It will still be about a month before beams travelling in opposite directions are brought together in collisions that some skeptics fear could create micro "black holes" and endanger the planet.

The project has attracted researchers from 80 countries, some 1,200 of them from the United States, which contributed $531 million of the project's price tag of nearly $4 billion.

"This only happens once a generation," said Katie Yurkewicz, spokeswoman for the U.S. contingent at the CERN project. "People are certainly very excited."