4 Written Questions

1. star systems with only two (2) stars
2. the average distance between earth and the sun (about 150 million kilometers)
3. a telescope with a curved mirror to concentrate light from distant objects
4. groups of two or more stars

3 Multiple Choice Questions

1. the brightness a star would have if it were the same distance from earth as all other stars
   1. luminosity
   2. apparent magnitude
   3. star system
   4. absolute magnitude
2. a measure of how bright an object looks
   from earth
   1. apparent magnitude
   2. binary star
   3. absolute magnitude
   4. astronomical unit
3. a telescope that uses a convex lens to concentrate light from distant objects
   1. eclipsing binary
   2. refracting telescope
   3. reflecting telescope
   4. spectroscope

3 True/False Questions

1. spectroscope → an instrument that spreads light
   into different wavelengths

   True        False

2. eclipsing binary → the true brightness of an object

   True        False

3. luminosity → the true brightness of an object

   True        False