Universe Crossword

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Across
  1. 3. A massive system of billions of stars held together by gravity
  2. 4. The invisible force that pulls objects with mass toward each other
  3. 6. The outdated model that placed Earth at the center of the universe
  4. 9. The curved path an object takes as it travels around another object in space
  5. 10. A star and all the objects that orbit around it
  6. 12. A rocky object smaller than a planet that orbits the sun
  7. 15. A natural or human-made object that orbits a larger body in space
  8. 16. A large round object that orbits a star and has cleared its path
  9. 17. The vast expanse containing all matter energy space and time
Down
  1. 1. A giant ball of hot glowing gas that produces its own light and heat
  2. 2. An Italian scientist who used a telescope to make major discoveries about our solar system
  3. 5. The sun and all the planets moons and other objects that orbit it
  4. 7. When light from an object stretches to longer wavelengths showing it is moving away
  5. 8. A frozen ball of ice and dust that develops a glowing tail near the sun
  6. 11. A planet that orbits a star outside of our solar system
  7. 13. The star at the center of our solar system that provides light and energy to Earth
  8. 14. The scientific study of stars planets and other objects in space