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See? Complex.
Dark matter is similar to what we think of as normal matter the kind we re made of in that is has mass and therefore gravity. But it doesn t emit light and doesn t interact with normal matter, making it the devil s own game to detect. We have plenty of reasons to think it exists, but we ve never been able to directly detect it.
Video of Dark Matter: Crash Course Astronomy #41
A lot of potential dark matter candidates have been eliminated over the years, leaving only ever more exotic possibilities, like subatomic particles that have not yet been discovered.
The leading candidate there is the axion, predicted to exist by current quantum models. They don t emit light, don t interact with normal matter except through gravity, could be extremely abundant in the Universe, and are very elusive. They fit the bill!
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