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Earth is the only planet in the solar system not named after a Roman or Greek deity. The hottest recorded temperature is 136 degrees Fahrenheit. Scientists believe that Earth once had two moons. The longest mountain rang... More »

Earth formed around 4.54 billion years ago and is the third planet from the Sun. It is the fifth largest planet in the solar system and the largest of the terrestrial planets. It is also the densest of all the planets. More »

The inner planets are composed of rock and metals, and possess a solid surface not found in the gas giants of the outer solar system. Mercury, Venus, Earth and Mars are the four planets closest to the Sun, and all have m... More »

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The one and only known home for life, Earth is one of the most interesting planets of the solar system. Life on Earth is extremely diverse; however, relative to Earth's size, all of life is contained within a very thin l... More »

One interesting fact about Earth is its status as the fifth planet in terms of size but the densest of all. It also ranks as the largest of the terrestrial planets in the solar system and the only one on which water exis... More »

In the year 1515, Nicolaus Copernicus theorized that the Earth was a planet and discovered the idea of a heliocentric solar system, a system in which all planets revolved around the sun. He built his own observatory in 1... More »

Earth is the only planet in the solar system that is not named after a Greek or Roman god. Instead, the name Earth is derived from Old English and Germanic languages. More »