As of 2015, scientists define dwarf planets as bodies that are similar to planets in that they orbit a star, are large enough to form a round shape and are not moons. However, dwarf planets do not have sufficient gravity... More »

The eight planets of the solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The four inner planets are terrestrial worlds, while the outer solar system consists of four gas giants sometime... More » Science Astronomy Planets

As of 2014, there are eight planets in Earth's solar system. In order by distance to the sun, the planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto was considered to be a ninth planet un... More »

Many other planets have moons. There are 166 natural satellites in the solar system orbiting six different planets, including Earth. Jupiter has 63 orbiting moons, followed by Saturn's 60. Uranus has 27 moons, Neptune ha... More » Science Astronomy Planets

The characteristics that the outer planets have in common include their large size and their large number of moons when compared with the inner, or terrestrial, planets. They also lack solid surfaces, and as far as astro... More »

Two planets, Venus and Mercury, are the only planets in the solar system that do not have any natural satellites or moons. Mercury, Venus, Mars and Earth are inner planets. More »

Six of the eight planets in the solar system are known to have moons. Mercury and Venus lack orbiting bodies of any significant size. Earth has one moon, Mars has two, and the gas giants have several moons each. More » Science Astronomy Planets