A rogue planet is a world that has been ejected from the planetary system in which it originally formed. Because rogue planets do not orbit a parent star, they are cast adrift into interstellar space. On their meanderings, rogue planets are pulled toward whatever large, gravitationally attractive body they happen to pass by. Most rogue planets are ejected during the early stages of planetary formation when planetary systems are more chaotic and there is more interaction among planets, David Bennett, a senior research scientist at NASA’s Goddard Space Flight Center,…
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