Giant Impact Theory which tells that a very big asteroid named 'theia' hit earth in a long time ago resulting a large debris ring which later formed moon....
The most widely accepted theory for the Moon's origin is the Giant Impact Hypothesis. This theory suggests that a Mars-sized object collided with a young Earth, ejecting debris that eventually coalesced to form the Moon. This theory is supported by similarities in isotopic compositions between Earth and the Moon.
Presently, the ejected ring theory best describes the origin of moon.
Evolution does not concern the origin of the universe. Evolution is a theory concerning the origin of species--diverse biological organisms--via mechanisms of inheritance with modification. The origin of the universe is best dealt with by the Big Bang theory.
either saturn or jupiter but your best bet is jupiter
I don't know of any planet with exactly 21 known moons. The best answer is probably "Uranus" with 27 moons (natural satellites).
force theory
Opponent-processing theory
opponent-process theory
The most widely accepted theory for the Moon's origin is the Giant Impact Hypothesis. This theory suggests that a Mars-sized object collided with a young Earth, ejecting debris that eventually coalesced to form the Moon. This theory is supported by similarities in isotopic compositions between Earth and the Moon.
repair and restoration theory
theory
theory
Presently, the ejected ring theory best describes the origin of moon.
Evolution does not concern the origin of the universe. Evolution is a theory concerning the origin of species--diverse biological organisms--via mechanisms of inheritance with modification. The origin of the universe is best dealt with by the Big Bang theory.
opponent-process theory
The trichromatic theory best explains color vision in humans. This theory suggests that there are three types of cones in the retina that are sensitive to different wavelengths of light, allowing us to perceive a wide range of colors.
World Systems Theory.