PAMELA satellite finds evidence of antimatter belt around Earth

By Mark Brown
08 August 11

Data from the cosmic ray satellite PAMELA has added substantial weight to the theory that the Earth is encircled by a thin band of antimatter.

The satellite, named Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics, was launched in 2006 to study the nature of cosmic rays -- high-energy particles from the Sun and beyond the solar system which barrel into Earth.

When those cosmic rays smash into molecules in the Earth's upper atmosphere, a shower of smaller particles is created. Physicists have assumed that a small number of those resulting particles will be anti-protons.

Most of those will be instantly annihilated when they collide with particles of ordinary matter. But those which don't collide should get trapped in the Earth's torus-shaped Van Allen radiation belt, and form a layer of antimatter in the Earth's atmosphere. the rest/image