Large Hadron Collider

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Scientists have successfully test fired the first beam of protons around the 27-kilometer underground tunnel below the Swiss-French border. The Large Hadron Collider - a multi-billion particle accelerator - was switched on at 07:30 GMT.  
The event marks the start of the biggest experiment in physics for a generation, and is hoped to shed light on the origins of the universe.

Ed ~ As a side note, it should be mentioned that although the forces and particle energies generated in the Large Hadron Collider are colossal, they pale into insignificance compared with the energies of natural cosmic rays generated in deep space, that bombard the earth everyday.

[blobrana]

Hum,
lets have a look at the first experiment....


LHC Compact Muon Solenoid Experiment Webcams

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Particles with higher energies are hitting the planet all the time; and according to string theory, mini-blackholes are forming and evaporating, in every bit of space, all the time.
But, it does seem that the coldest place in the observable universe is to be found in labs on the earth, (the Boomerang nebula is the coolest, so far, in nature).