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Antimatter loses again

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7:38pm, August 17, 2004

Physicists have added another piece to the puzzle of why so little antimatter exists in today's universe.

In theory, the explosive birth of the universe produced equal amounts of matter and antimatter. Those incompatible substances didn't completely annihilate one another. Enough matter survived to form galaxies and other features of the universe. However, scientists looking for naturally occurring antimatter have found only a smidgeon of it, for instance, in cosmic rays.

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