MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Particle tracks and cosmology. Conceptual computer illustration of human understanding of particle physics as heads viewing subatomic particle tracks (white spirals) on an astronomical artwork. The coloured points represent particles. The tracks result from energetic charged particles moving through a bubble chamber containing a superheated liquid. Ionisation of the liquid by the particles causes it to boil, so that tracks of minute bubbles are left in their wake. Each particle creates a distinct track, such as the spirals made by electrons and positrons. Particle physics has revealed the basic structure of the atoms which form the universe.
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