what is dark matter ? with full explain?
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Answer:
Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241×10−27 kg/m3. ... Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet undiscovered subatomic particles.
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Explanation:
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. ... Scientists believe that dark matter may account for the unexplained motions of stars within galaxies.
Dark matter is the most mysterious, non-interacting substance in the Universe. Its gravitational effects are necessary to explain the rotation of galaxies, the motions of clusters, and the largest scale-structure in the entire Universe.
Dark matter is the term astronomers use to describe material in the universe that does not emit or reflect light and is, therefore, invisible.
Examples - Stars, nebulae, and galaxies are examples of luminous objects in the sky.