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|mhl=1420 a<ref name=calc/>
|mhl=1420 a<ref name=calc/>
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The '''Earth''' is the only known [[planet]] in our '''Solar System''' which can support [[life]]. It contains [[water]], reasonable levels of [[oxygen]], and a stable [[temperature]] range. Geometrically speaking, Earth is the largest of the terrestrial (rocky) planets in the [[solar system]].
The '''Earth''' is the only known [[planet]] in our '''Solar System''' which can support [[life]]. It contains [[water]], reasonable levels of [[oxygen]], and a stable [[temperature]] range. Geometrically speaking, Earth is the largest of the terrestrial (rocky) planets in the [[solar system]]. It is approximately 4.5 billion years old.
==Physical Description==
==Physical Description==