Unit 1 Astronomy Crossword

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Across
  1. 2. A collection of millions and billions of stars (their systems), dust, and gas bound together by gravity
  2. 4. Contains all of the star systems, galaxies, gas and dust, plus all the matter and energy
  3. 6. A model of the solar system in which Earth and the other planets revolve around the sun
  4. 8. An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
  5. 9. The path of an object as it revolves around another object in space
  6. 10. The spinning of Earth on its axis
Down
  1. 1. An object that orbits a star, is large enough to have become rounded by its own gravity and has cleared the area of its orbit.
  2. 3. Wobble in Earth's rotational axis
  3. 5. A model of the universe in which Earth is at the center of the revolving planets and stars.
  4. 7. A force of attraction between objects that is due to their masses.