Unlike baryonic matter, dark matter neither emits nor absorbs light or other forms of electromagnetic energy. ![]() Astronomers classify all of this stuff as baryonic matter, and they know its most fundamental unit is the atom, which itself is composed of even smaller subatomic particles, such as protons, neutrons and electrons. They know, for example, that dark matter behaves differently than "normal" matter, such as galaxies, stars, planets, asteroids and all of the living and nonliving things on Earth. ![]() Just because scientists don't know what to call dark matter doesn't mean they don't know anything about it.
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