Topics 1 & 2 Vocab

4. Earth-centered model of the universe
5. the lens through which you view a magnified object using a telescope; eyepiece
6. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric
8. all objects seen in the sky (ex: Sun, Moon, planets, stars)
13. the location of a celestial body relative to a fixed Earth (as though celestial bodies circled the Earth)
19. Sun-centered model of the universe
20. the large lens at the front of the telescope

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