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Asteroids bombarded the entire solar system and impacted Earth in vast cataclysms for hundreds of millions of years. A smaller planet called Theia smashed into proto-Earth, knocked it off its axis, which is why there are seasons, and splashed up debris that became the Moon, which is why there are tides. It is literally called the Hadean period. Before four billion years ago, Earth was a hellscape. The reason for that belonging, that life on Earth is a single family, resists breezy summary. Caron calls it “an organism to which we all belong.” There is, for example, a display on LUCA, the last universal common ancestor of every creature on Earth today, thought to have lived as far back in time as the oldest known fossil. “We want people to realize how long it took to get to where we are today,” he said. Caron calls it a unique opportunity to address a forgotten four billion years. This is the story of life growing up, back in the day. Never mind the dinosaurs, not even half as old as that. This advertisement has not loaded yet, but your article continues below.
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