Antimatter in Space: How Could It Exist?

In summary, scientists approximated in 1977 that there is a deposit of antimatter in the center of our galaxy. The question arises of how antimatter can exist freely in space without immediately being destroyed upon contact with matter. However, it has been observed that in low-density environments, such as in space, positrons (a type of antimatter) can exist for a longer period of time before being annihilated by electrons.
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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
 
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http://astro.estec.esa.nl/Integral/POMJan2004.html

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).
 
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Thank you for the information! :smile:
 

1. What is antimatter and how is it different from regular matter?

Antimatter is composed of particles that have the same mass as regular matter, but with opposite charge. For example, the antimatter counterpart of an electron is a positron, which has a positive charge instead of a negative charge. When antimatter and regular matter come into contact, they annihilate each other and release a large amount of energy.

2. How is antimatter created?

Antimatter can be created through high-energy collisions, such as those that occur in particle accelerators. It can also be produced naturally in some radioactive decays. However, antimatter is typically only present in very small amounts in the universe.

3. Can antimatter exist in space?

Yes, antimatter can exist in space. In fact, scientists have detected small amounts of antimatter in cosmic rays and in the vicinity of some astronomical objects, such as black holes. However, it is not very abundant in the universe and is often difficult to detect.

4. What are the potential applications of antimatter in space?

One potential application of antimatter in space is in propulsion systems for spacecraft. Antimatter could be used to produce a high amount of energy, allowing for faster and more efficient space travel. It could also be used in power generation for long-term space missions.

5. Is there any danger in studying or using antimatter in space?

While antimatter may seem like a dangerous substance, it is actually quite safe to study and use in controlled experiments. The amount of antimatter created in laboratories is very small, and it is typically contained and studied in highly controlled environments. However, if a large amount of antimatter were to come into contact with regular matter, it could potentially release a significant amount of energy. Therefore, proper precautions must be taken when working with antimatter.

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