A Mars-Like Planet Might Be Hiding in the Outer Solar System

. Unlike the massive (and completely hypothetical) Planet Nine, this one is believed to be a small, rocky world like Mars.Now Read:

  • Astronomers Create ‘Treasure Map’ to Find Proposed Planet Nine
  • Citizen Astronomer Detects Ancient Failed Star With Unexpected Properties
  • Earth Will Lose Its Oxygen in a Billion Years, Killing Most Living Organisms

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