5 Written Questions

1. the rise and fall of the level of water in the ocean
2. an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
3. the day of the year that marks the beginning of fall in the Northern Hemisphere
4. the attractive force between two objects
5. a meteoroid that has hit Earth's surface

5 Matching Questions

1. neutron star
2. geocentric
3. lunar eclipse
4. protostar
5. galaxy

1. a a contracting cloud of gas and dust; the earliest stage of a star's life
2. b a tiny star that remains after a supernova explosion
3. c the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
4. d the description of the solar system in which all of the planets revolve around Earth
5. e a giant structure that contains hundreds of billions of stars

5 Multiple Choice Questions

1. a galaxy whose arms curve outward in a pinwheel pattern
   1. parallax
   2. spiral galaxy
   3. galaxy
   4. elliptical galaxy
2. a round pit on the moon's surface
   1. meteor
   2. phase
   3. quasar
   4. crater
3. the middle layer of the sun's atmosphere
   1. chromosphere
   2. core
   3. photosphere
   4. protostar
4. a very large star, much larger than the sun
   1. giant star
   2. protostar
   3. binary star
   4. light-year
5. the study of the moon, stars, and other objects in space
   1. asteroid
   2. equinox
   3. corona
   4. astronomy

5 True/False Questions

1. equinox → the two days of the year on which neither hemisphere is tilted toward or away from the sun

   True        False

2. core → a ball of ice and dust in space whose orbit is a long, narrow ellipse

   True        False

3. photosphere → the middle layer of the sun's atmosphere

   True        False

4. absolute magnitude → the brightness of a star as seen from Earth

   True        False

5. inertia → the outer layer of the sun's atmosphere

   True        False