Earth is roughly 4.5 billion years old, but her early eons were tempestuous. Not even rock survives from the first 500 million years of her life--an eon known as the Hadean--because geologists speculate the planet's surface boiled and bubbled with molten lava under a steady bombardment of comets and meteorites. But tiny diamonds discovered in antediluvian zircon crystals sprinkled in three-billion-year old rocks from Australia hint that the planet's surface fire might have ceased much earlier than previously believed.
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