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GOD is one answer - or rather a faith.

Science would have it that the Earth, as part of the Solar system is a third generation system.

The first generation was the Big Bang about 14 billion years ago. This led to the formation of Galaxies and Stars (the second generation), and eventually some of the larger or unstable stars went nova, and exploded.

In the huge temperatures and timescales of these explosions more elements were made, (carbon for example). This debris was scattered into space, eventually to coalesce into the Third Generationsystems such as our Solar system.

Our Solar system formed about 4.5 billion years ago.

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14y ago

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