Space Exploration Unit Vocabulary- Topic 1 and 2

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