Earth in Space and Time

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Across
  1. 3. a large, round object that revolves around a star and have cleared the region around its orbit
  2. 5. to move in a circle on a central axis
  3. 6. a small body of matter from outer space that enters the earth’s atmosphere; a shooting star
  4. 7. an imaginary line about which an object rotates
  5. 11. an optical instrument designed to make distant objects appear nearer
  6. 14. Any of the four planets in the solar system beyond Mars; Jupiter Saturn, Uranus, Venus
  7. 15. the path an object takes as it revolves around a star, planet or moon
  8. 16. the star around which the earth orbits, the center of our solar system
  9. 17. our home galaxy
  10. 18. a frozen mass of different types of ice and dust orbiting the sun
  11. 19. a natural object that revolves around a planet
Down
  1. 1. a spacecraft that gathers data without a crew
  2. 2. a rocky mass up to several hundred kilometers wide that revolves around the sun
  3. 4. any of the 4 closest planets to the sun; Mercury, Venus, Earth, Mars
  4. 8. a huge system of gas, dust, stars and objects held together by gravity
  5. 9. the sun and its planets, along with moons, asteroids and comets
  6. 10. a huge ball of very hot gas that gives off energy
  7. 12. the curved path of an object around a star, planet or moon
  8. 13. the spinning of an object on its own axis