Topics 1 & 2 Vocab

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Across
  1. 2. the ocular lens of a telescope
  2. 4. a ray of light changing direction when it bounces off a surface
  3. 5. the device used to measure the altitude of an object
  4. 6. a model of the universe that places Earth at the center, with the Sun and planets revolving around it ; geocentric
  5. 11. the device used to measure the azimuth of an object
  6. 13. the lens through which you view a magnified object using a telescope; eyepiece
  7. 16. the location of a celestial body relative to a fixed Earth (as though celestial bodies circled the Earth)
  8. 18. the large lens at the front of the telescope
  9. 19. a ray of light changing direction when it passes through a new substance
  10. 20. a figure that looks like a squashed circle; planets move in elliptical orbits around the Sun
Down
  1. 1. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric
  2. 3. Newton’s law states that all objects attract all other objects and provides an explanation for the planet’s elliptical orbit
  3. 7. Sun-centered model of the universe
  4. 8. all objects seen in the sky (ex: Sun, Moon, planets, stars)
  5. 9. determines the fineness of a detail a telescope can produce of an object view
  6. 10. Earth-centered model of the universe
  7. 12. the angle measured clockwise from North when determining the location (altitude-azimuth co-ordination) of a celestial body
  8. 14. the angle measured above a horizon when determining the location (altitude-azimuth co-ordination) of a celestial body
  9. 15. a set of axes of any kind that is used to describe the positions or motions of things
  10. 17. groupings of stars that form patterns, which appear like objects and are given names (ex: Orion, The Big Dipper)
  11. 21. celestial bodies that orbit a star in a solar system (ex: Earth, Mars, Neptune)