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Scientists in Switzerland have started up a machine designed to accelerate sub-atomic particles to nearly the speed of light and then smash them into each other in a bid to find out how the universe began.
The project began operations on Wednesday, but its critics fear that it could go wrong and create a black hole that would destroy the Earth.
The Large Hadron Collider, housed in a tunnel 100 meters below ground straddling the French-Swiss border, has cost more than $5.4bn and has been almost two decades in the making.
Scientists monitoring the collider on computer screens burst into applause when Lyn Evans, the project leader, announced, "We've got a beam on the LHC."
'Big Bang'
Over two thousand scientists from around the world have worked on the project which hopes to observe a particle known as a Higgs Boson that scientists hope will explain how particles pick up mass.
The Higgs was named after Peter Higgs, a British physicist who devised the theory of its existence in 1964.
The collider will send protons in opposite directions along a 27km circuit - the protons will travel the 27km 11,000 times per second - and at four points the protons will intersect and smash together.
Scientists will monitor the collisions and collect data on the particles created by these collisions, which they say will come close to re-enacting the "big bang" - the theory that from a colossal explosion was created the universe.
The project could also help prove the theory of supersymmetry, a theory in particle physics that suggests every particle has a corresponding partner particle.
The collider began work at 9.30am local time (0730 GMT) with the first protons injected into the 27km, ring-shaped tunnel at the headquarters of the European Organization for Nuclear Research (Cern).
Prior to the launch, the internet was abuzz with rumors that the particle accelerator could create black holes or an as-yet hypothetical particle called a strangelet that would grow and destroy the earth.
A black hole has a gravitational field so powerful that it pulls particles, including light, into itself.
But staff on the project have reject the claims.
"Nothing's going to happen here that's not already happening in nature," Mario Nessi, the projects technical director, said.
Cern says it has commissioned a panel to verify its calculations that such risks are virtually impossible.
PHOTO CAPTION
Scientists look at computer screens at the control centre of the CERN in Geneva September 10, 2008.
Al-Jazeera
