- Mysterious Planet X May Really Lurk Undiscovered in Our Solar System http://www.space.com/28284-planet-x-worlds-beyond-pluto.html?onswipe_redirect=never 5 comments space
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- Space.com: NASA, Space Exploration and Astronomy News https://space.com 152 comments
- Mysterious Planet X May Really Lurk Undiscovered in Our Solar System | Space http://www.space.com/28284-planet-x-worlds-beyond-pluto.html 32 comments
- Trans-Neptunian objects suggest that there are more planets in the solar system http://www.agenciasinc.es/en/news/trans-neptunian-objects-suggest-that-there-are-more-planets-in-the-solar-system 23 comments
- Solar system planets, order and formation: A guide | Space http://www.space.com/16080-solar-system-planets.html 6 comments
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