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  1. About the Planets - Science@NASA

  2. Solar System Exploration - NASA Science

  3. Solar System - Wikipedia

  4. Planet - Wikipedia

  5. All About the Planets | NASA Space Place – NASA Science for Kids

  6. Eyes on the Solar System - NASA/JPL - NASA's Eyes

  7. All About the Planets | NASA Space Place – NASA Science for Kids

  8. The Nine Planets of The Solar System | Eight Planets Without Pluto

  9. Planet | Definition, Characteristics, & Facts | Britannica

  10. Solar system planets, order and formation — a guide | Space