The Chicxulub asteroid impact, which occurred about 66 million years ago, is believed to have played a significant role in the mass extinction event that wiped out the dinosaurs. However, the formation of Earth itself occurred much earlier, around 4.5 billion years ago. After the impact, the planet underwent significant geological and ecological changes, leading to the eventual rise of new species and ecosystems over millions of years. Thus, the Earth was already formed long before the Chicxulub event, but recovery and evolution following the impact took tens of millions of years.
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