400 Earth-sized rogue planets may be roaming the Milky Way

New predictions suggest that an upcoming NASA space telescope could spot more than 400 hidden Earth-mass worlds in the Milky Way that have “gone rogue” and thus wander alone in our galaxy.

Such orphaned worlds are thought to begin their lives in a planetary system, similar to the solar system, but are eventually ejected by a hitherto unknown mechanism. Despite the familiar picture of planets orbiting a star in an orderly fashion, new research suggests that such starless orphan worlds could outnumber stars in the Milky Way by 20 to 1. This implies that unbound worlds in our galaxy are about six times more common than planets orbiting parent stars.

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Image Source : www.space.com

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