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Antimatter in space?

  1. Jan 19, 2005 #1
    I've read that in 1977, scientists approximated that there is a deposit of antimatter in the center of our galaxy. How could antimatter exist freely in space while coming into contact with matter? I know that once antimatter and matter come into contact, they are destroyed immediately while releasing a large amount of energy. Does anyone have an explanation for this?

    Source: http://science.howstuffworks.com/antimatter1.htm
    Last edited: Jan 19, 2005
  2. jcsd
  3. Jan 20, 2005 #2


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    Here is the best data to date (AFAIK - INTEGRAL SPI). Another link

    As to how positrons (the only anti-matter observed to date, other than anti-protons etc in cosmic rays) can exist without being annihilated ... if the space density of matter is low (say, < 10^3 electrons/cm^3), positrons can 'sit around' for a long time before they meet their nemises (electrons).
  4. Jan 20, 2005 #3
    Thank you for the information! :smile:
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