Question

Define antimatter, dark matter.

Answer 1

⭐Antimatter is defined as a material composed of the antiparticles of the corresponding particles of ordinary matter. ... For example, a positron and an antiproton can form an antihydrogen atom.

⭐Dark matter is a hypothetical form of matter that is thought to account for approximately 85% of the matter in the universe, and about a quarter of its total energy density. ... Because dark matter has not yet been observed directly, it must barely interact with ordinary baryonic matter and radiation.