Why do we call dark matter dark?
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Dark matter is thought to exist in order to explain a variety of gravitational effects that have been seen but has not yet been directly discovered by astronomers.
Dark matter does not interact with the electromagnetic force as regular matter does. This makes it incredibly difficult to identify since it does not absorb, reflect, or emit light.
Dark matter is so-called because it doesn’t seem to interact with the electromagnetic field, which means it doesn’t generate electromagnetic radiation like light or absorb electromagnetic radiation like it does. As a result, it is hard to detect.