the universe began in a single instant 13 to 15 billion years ago. all existing matter and energy suddenly appeared and spread outward, gas condenses to form stars, planets formed from build up of dust and debris.
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Precambrian Era
from Earth’s formation through about 90% of its history
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Hadeon eon
hell-like, little to no oxygen
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evidence of early water
zircon crystals 4.4 billion years ago provide the earliest of this…