When the $6billion Large Hadron Collider starts up, it will smash particles together in an attempt to recreate the conditions of the early universe, fractions of a second after the Big Bang.

The experiment's opponents, who have taken its architects to court in the United States and France, believe it will create black holes in which the Earth could disappear.

Melbourne University physicist Geoff Taylor has led the Australian contingent which designed detectors and shielding as well as software that triggers the collection of information. The collider is housed in a 27km-long tunnel 50 to 175m below the ground that runs under Geneva airport and surrounding villages and farmland in Switzerland.

As the particles smash together they will break apart into smaller, more fundamental components, giving physicists a fleeting chance to observe those particles, some of which have never been seen before.

Professor Taylor says the experiment's opponents are completely misguided in their stance.

''One of the things we are trying to do is create mini-black holes which scientifically would be a magnificent thing and tell us we don't live in three dimensions, but that we live in nine or 10 dimensions,'' Professor Taylor said.

''As soon as you say there is the possibility of creating black holes, you have people saying we are going to be swallowed up by black holes.

''That's where the furore has come and it's completely misguided.''

Professor Taylor said if today's experiment showed there were more than the three dimensions height, width and depth it could change the way we looked at life. One of the most anticipated products might be the elusive Higgs boson, or the God Particle, which could explain how other elementary particles acquired properties such as mass.

If scientists verify the existence of the Higgs boson, it would be a big step in the search for a Grand Unified Theory, which aims to bring together three of the four known fundamental forces: electromagnetism, the strong nuclear force and the weak nuclear force, leaving out only gravity.

''One of the key reasons for building the machine is to find out if [the God Particle] exists,'' Professor Taylor said.

''The existence of such a particle would give us a whole new view on the structure of the universe.''

Australian Institute of Physics president Cathy Foley said particles would be smashed together at speeds that generated large amounts of energy.

''Each collision of a pair of protons in the LHC will release an amount of energy comparable to that of two colliding mosquitoes.'' she said.

''It's like a rice-bubble pop.''