Space Exploration Unit Vocabulary- Topic 1 and 2

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Across
  1. 2. A model of the universe that places the Earth at the center with the sun, moon and planets revolving around it.
  2. 4. A change of direction of a ray of light, sound or heat in passing through one medium into another.
  3. 5. To cast back light, heat or sound from a surface.
  4. 6. Lens from where you view a magnified object using a telescope.
  5. 9. Used to locate a celestial body relative to a fix Earth.
  6. 12. Celestial bodies in our solar system that orbits the sun.
  7. 15. Figure that looks like a squashed circle. Planets in the solar system travel in a similar manner.
  8. 16. Determines the fineness of detail a telescope can produce of an object.
  9. 19. Grouping of stars that form patterns and are given names.
  10. 20. Another word for ocular lens.
Down
  1. 1. Objects seen in the sky like the sun and the planets.
  2. 3. A set of axes of any kind used to determine a position or motion of things.
  3. 7. Device used to measure the azimuth of an object.
  4. 8. A model of the universe that places the sun at the center with the planets and moon revolving around it.
  5. 9. Angle measured from above the horizon in degrees.
  6. 10. Newton’s law that states all objects attract other objects and provided an explanation for the planets' orbit.
  7. 11. Angle measured clockwise from north.
  8. 13. Another word for earth-centered.
  9. 14. Large lens at the front of a telescope.
  10. 17. Device used to measure the altitude of an object.
  11. 18. Another word for heliocentric.