Physics Question #164

Hongyi Li, a 13 year old male from the Internet asks on April 17, 2000,

Does antimatter's gravity have the same properties ordinary matter?

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The answer

Ian Keith Affleck answered on April 17, 2000

Yes. For instance, a positron (which is an anti-electron) is identical to an ordinary electron except that it has a positive charge instead of a negative charge. It has exactly the same mass and experiences exactly the same gravitational force. The electrical force between a pair of positrons is also exactly the same as between a pair of electrons also. However, while a pair of electrons or a pair of positrons repel each other through the electrical force, one positron and one electron attract each other.

Thus they are pulled together and will eventually annihilate.

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