Planetary science deals with planets and other bodies orbiting around a star. Planets
move according to the principle of creation, having give and take action with the central star. Especially, solid planets are very important objects on which human beings and other lifeforms may be able to live. The question whether the Earth
was formed by the will of a higher existence for human beings to life, it was formed just by accident, or there are may other Earth-type planets around other stars is a long-pursued one. According to the Unification Thought
, every existence has a purpose for the whole as well as its own individual purpose. Planets cannot exist without contributing to a higher purpose. The Earth serves all lifeforms on it, and other planets and other bodies including the Moon
in our solar system
contribute to the formation and stabilization of the Earth and to our activities for understanding the origin and evolution of our solar system.