The Universe

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Across
  1. 1. A smaller body that orbits most planets.
  2. 8. The types of molecules in this layer absorb radiation from the sun.
  3. 9. The closest star to the sun and Earth.
  4. 11. A spherical body that orbits the sun.
  5. 12. Areas where galaxies are densely concentrated.
  6. 15. The distance light travels through space in one year.
Down
  1. 2. Element that is needed to support animal life on Earth.
  2. 3. Space and all the matter and energy in it.
  3. 4. Structure that the universe is compared to.
  4. 5. A large collection of stars, gas, and dust.
  5. 6. A vast area of empty space in the universe.
  6. 7. A large celestial body that is composed of gas and emits light.
  7. 10. The name of our solar system.
  8. 13. A collection of large or small bodies that orbit a central star.
  9. 14. The number of planets in our solar system.