MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Particle tracks and cosmology. Computer illustrat- ion of subatomic particle tracks (red) on an historical star chart. The particles are seen as coloured points. The tracks result from 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 of electrons and positrons. Particle physics has revealed the basic structure of the atoms that form the universe.
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