Tiny rogue planet is the smallest free-floating exoplanet candidate yet

Astronomers have spotted the smallest “rogue planet” candidate yet known, a world possibly smaller than Earth that apparently cruises through our Milky Way galaxy unattached to a star.

The potential exoplanet has a mass that’s somewhere between that of the Earth and Mars, which is just 10% as hefty as our world. If confirmed, the discovery would be a big milestone in the study of rogue planets, which are thought to be incredibly abundant throughout the galaxy and beyond but are very difficult to detect.

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