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www.reference.com/article/planets-be82a803781eb21b

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 sometimes known as the Jovian planets.

www.reference.com/article/many-planets-d340b12d592212c7

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 until 2006, when it was demoted to a dwarf planet.

www.reference.com/science/planets-made-84c007560127d38f

The inner planets, Mercury, Venus, Earth and Mars, are made up of silicate rock and heavy metals such as iron and nickel, whereas the outer planets, Jupiter, Saturn, Uranus and Neptune, are made up mostly of gases, according to Universe Today. The outer planets are subd...

www.reference.com/article/type-planet-earth-bde776145ac4de8

According to Encyclopædia Britannica, Earth is classified as a terrestrial planet. A terrestrial planet is rocky, in contrast to the predominantly gas planets found in the outer solar system.

www.reference.com/article/many-planets-universe-548265ff2e3530b7

People have been studying the universe for as long as humans have been looking up at the stars. While much is known about outer space, the exact number of planets is still an estimate.

www.reference.com/article/planets-moons-92c5b5b97de2a387

In this solar system, Mercury and Venus have no moons. Mercury is the smallest planet in the solar system and only slightly larger than Earth's moon. It is the closest planet to the Sun. Venus is the second closest planet to the Sun and is slightly smaller than Earth.

www.reference.com/article/type-planet-mars-21e9eccbe5580577

Mars is known as a terrestrial planet, which means it has a solid surface made or rocks and other materials. This feature contributes to significant human interest in studying the possibility of life on Mars. Like Earth, Mars consists of layers of core, mantle and crust...