Space Exploration Unit Vocabulary- Topic 1 and 2

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