Earth

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Earth, also known as the Earth, Terra, and (mostly in the 19th century) Tellus, is the third-closest planet to the Sun. It is the largest of the solar system's terrestrial planets, and the only planetary body that modern science confirms as harboring life. The planet formed around 4.57 billion (4.57×109) years ago, and shortly thereafter (4.533 billion years ago) acquired its single natural satellite, the Moon.

Related Topics:
Terra - 19th century - Tellus - Planet - Sun - Solar system - Terrestrial planet - Modern science - Life - Formed - Billion - Year - Natural satellite - Moon

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Its astronomical symbol consists of a circled cross, representing a meridian and the equator; a variant puts the cross atop the circle (Unicode: ⊕ or ♁). Besides words derived from Terra, such as terrestrial, terms that refer to the Earth include tellur- (telluric, tellurian, from the Roman goddess Tell?s) and geo- (geocentric, geothermal (from the Greek goddess Gaia).

Related Topics:
Astronomical symbol - Meridian - Equator - Unicode - Telluric - Tellurian - Roman - Goddess - Geocentric - Geothermal - Greek - Gaia

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