The generally accepted starting point for the age of the Earth is the time of its formation from the solar nebula, which occurred about 4.54 billion years ago. The solar nebula was a rotating cloud of gas and dust left over from the formation of the Sun, and it eventually collapsed under its own gravity to form the Sun and the planets of the solar system, including the Earth. The age of the Earth is determined by dating the oldest rocks on the planet, which are about 4 billion years old, and by studying the isotopic composition of meteorites, which are believed to be remnants of the early solar system.
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