For example, the planet Mars appears to be retrograde when the Earth overtakes and passes by it as they both move around the Sun. Until the discovery of Jupiter's four main moons by Galileo Galilei, bodies in orbit around a planet were called moons. The word satellite is used interchangeably with moon, and astronomers speak and write about the moons of Neptune, Saturn, etc. The term satellite is also used to describe man-made devices of any size that are launched into orbit. Stars derive their energy from nuclear reactions going on in their interiors, generating their own heat and light.
Stars are very large.
A dwarf star is a small star that is of relatively low mass and average or below average luminosity. The Sun is a yellow dwarf, which is in its main sequence, or prime of life. This means that nuclear reactions of hydrogen maintain its size and temperature. By contrast, a white dwarf is near death in the life cycle of a star. A red giant is a star nearing the end of its life.