Don't confuse dark matter and anti-matter as many people do. Dark matter is classical matter but either does not emit or reflect enough light so that we can see it. We can see its effects on surrounding objects though. Anti-matter is much more complex. It has been explained to me as classical matter with the charges reversed. For example, a particle with the mass of an electron but with a positive charge is a positron. Scientists have created very small amounts of anti-hydrogen in particle accelerators. There are also particles which I am not sure how to classify such as neutrinos, which are thought to have no mass.

• antimatter, dark matter - danieldgj - February 28, 2003 - 00:33 UTC