This is a photo of the laser measuring the prime meridian from the Greenwich Observatory.
These are happy physicists after a successful proton collision on Wednesday at the Cern Massive Hadron Collider (above) under the Swiss Alps, near to Geneva.
These experiments help recreate conditions as they existed billionths of a second after the Big Bang, which formed the universe and space-time, no big deal. The protons in turn break down into smaller constituent parts and enable physicists to study the fundamental nature of matter.
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