Topics 1 & 2 Vocab

5. a ray of light changing direction when it bounces off a surface
7. celestial bodies that orbit a star in a solar system (ex: Earth, Mars, Neptune)
9. all objects seen in the sky (ex: Sun, Moon, planets, stars)
10. the lens through which you view a magnified object using a telescope; eyepiece
13. the angle measured above a horizon when determining the location (altitude-azimuth co-ordination) of a celestial body
14. Sun-centered model of the universe
15. Newton’s law states that all objects attract all other objects and provides an explanation for the planet’s elliptical orbit
18. the device used to measure the altitude of an object
19. Earth-centered model of the universe
20. a model of the universe that places Earth at the center, with the Sun and planets revolving around it ; geocentric

1. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric
2. the large lens at the front of the telescope
3. the location of a celestial body relative to a fixed Earth (as though celestial bodies circled the Earth)
4. a set of axes of any kind that is used to describe the positions or motions of things
6. the ocular lens of a telescope
8. groupings of stars that form patterns, which appear like objects and are given names (ex: Orion, The Big Dipper)
11. a figure that looks like a squashed circle; planets move in elliptical orbits around the Sun
12. the angle measured clockwise from North when determining the location (altitude-azimuth co-ordination) of a celestial body
16. determines the fineness of a detail a telescope can produce of an object view
17. a ray of light changing direction when it passes through a new substance
21. the device used to measure the azimuth of an object