Dark matter is a type of matter that is smaller than photons and electrons.
It carries no charge, does not interfere with electrons, and can freely travel through electromagnetic waves and gravitational fields.
The density of dark matter is extremely small, but the quantity is very large, and the total mass is more than 4.5 times that of baryonic matter!
For people living in the material world, dark matter cannot be directly observed.
They can only be felt through the light waves and gravitational pull of the interfering stars.
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