ANSWERS: 3
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Mercury was heavily bombarded by comets and asteroids during and shortly following its formation 4.6 billion years ago. Cheers
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Mercury formed around the same time as Earth formed so that would be in the range of 4.6BILLION YEARS!this is determined by comparing the age of rocks from Mars & from Earth.
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A 1979 Ford Mercury is 30 years old. The planet is about 6000 years old: http://www.answersingenesis.org/get-answers/topic/astrophysics
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