Topics 1 & 2 Vocab

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