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All the gold that exists on the Earth can only be formed by a nuclear reaction. These nuclear reactions occurred in an exploding star (called a supernova) before the Earth itself existed. Most gold, however, is thought to have originated during collisions of neutron stars due to gold's neutron rich make-up as well as the known energy levels needed to create it. This may help to explain its rarity since neutron star collisions are rare.

The cloud of gas and dust from supernovas and neutron star collisions contained all the elements that are present on earth today. This cloud eventually condensed into the Sun and the Solar System.

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12y ago

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