Comets glow partly by the reflection of sunlight but mainly through the excitation of their gases by solar ultraviolet radiation.
Meteors are the flashes of light that meteoroids produce when they enter the earth's atmosphere.
Fallen meteoroids are called meteorites . In order from the sun, the planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune , and Pluto . All but Mercury and Venus have satellites. In addition, thousands of asteroids are in orbits that lie between those of Mars and Jupiter. The planets and their satellites are visible by virtue of the sunlight they reflect.