Comets are Natural Sources of Antimatter

The announcement was made at April 2002 joint meeting of the of American Physical Society and American Astronomical Society. 

As comets approach the Sun, solar dust particles blast more
antimatter off the comet to form the coma around the nucleus.

The solar wind pulls the plasma off the coma into the comet�s tails. 

Matter and antimatter conversions produce a spectrum
of radiation that includes gamma rays, x-rays, and light.
 

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