The elusive axion particle is many times lighter than an electron, with properties that barely make an impression on ordinary matter. As such, the ghost-like particle is a leading contender as a component of dark matter—a hypothetical, invisible type of matter that is thought to make up 85 percent of the mass in the universe.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/3bWwp7n
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