What is dark matter?
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Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly. We know that dark matter exists because of the effect it has on objects that we can observe directly.
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In some cosmological theory non_luminous material that is postulated to exist in space and that could take any of several form including weakly interacting praticles (Cold dark matter) or high energy randomly moving particle created soon after the Big Bang (hot dark matter).
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