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Is Jupiter a friendly planet, Earth's enemy, or perhaps both? For decades, scientists have talked about how the giant gas planet keeps some asteroids from striking our small world, while others have pointed out that Jupiter's gravity could send some civilization-shattering asteroids our way. What if Jupiter had had a more eccentric orbit? Could that have affected the habitability of Earth? A new peer-reviewed study examines these questions in more detail. [Source: Astrobiology Magazine]
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