1. White dwarfs are not included in the luminosityclassification because they are:
a) no longer producing energy by nuclear reactions
b) too small
c) not yet active stars; they have not yet begun nuclearreactions
d) no longer radiating energy away
2. Absolute magnitude is defined as the apparent magnitude that astar would have if
a) it were located at exactly 10 pc from Earth
b) it were located at exactly 10 AU from Earth
c) all the energy from the star was concentrated in the visualregion
d) it were located at exactly 10 ly from Earth
3. What is a dwarf star?
a) main-sequence star
b) a star that is significantly smaller than a giant or supergiantstar
c) large, planetary object, such as Jupiter
d) a star of about the same size (diameter) as Earth
