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what did earth look like 4 billion years ago	planets 4 billion years ago
earth 4 billion years ago	solar system 4 billion years ago
venus 4 billion years ago	putin 4 billion years ago
jupiter 4 billion years ago	universe 4 billion years ago
mars 4 billion years ago	3.4 billion years ago
how long was a day 4 billion years ago	how close was the moon 4 billion years ago