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Passing Stars May Have Kept a Distant Alien World Tethered to Its Sun

by Joel Hruska

We tend to think of our Solar System as a static, constant environment. The implications of the protoplanetary disc and the demarcation line between our inward rocky planets, the outer gas giants, and the farthest “ice giants” all combine to create a nifty little model in which the heaviest bands of material with the most rock…

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