Unlike other planets and even our own moon, the Earth has relatively stable temperature conditions and compared to other planet it doesn’t become too hot or cold. This is primarily possiblt because of the Earth’s atmosphere which acts like a shield.
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The presence of large quantities of water and oxygen also contribute to the existence of life on Earth. Besides this the Earth’s atmosphere has a layer of a gas called Ozone which is form of oxygen, this layer filters the Sun’s harmful ultra violet rays thus saving life form. From what is known so far none of these conditions exist on any other planet which explains why there is life on Earth.
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