Red giant stars are I. more luminous than the sun. II. larger in diameter than the sun. III. cooler ...

Red giant stars are I. more luminous than the sun. II. larger in diameter than the sun. III. cooler than B stars. IV. located above the main sequence stars in the H-R diagram.
 
  a. I & II
  b. II & IV
  c. I, II, & IV
  d. II, III, & IV
  e. I, II, III, & IV

Question 2

The saros cycle
 
  a. was used in ancient times to predict eclipses.
  b. is 18 years, 11 1/3 days long.
  c. comes from a Greek word that means repetition.
  d. all of the above
  e. none of the above

Question 3

We know that giant stars are larger in diameter than the sun because
 
  a. they are more luminous but have about the same temperature.
  b. they are less luminous but have about the same temperature.
  c. they are hotter but have about the same luminosity.
  d. they are cooler but have about the same luminosity.
  e. they have a larger absolute magnitude than the sun.

Question 4

A lunar eclipse that occurs when the moon moves completely into Earth's umbral shadow is called
 
  a. a total solar eclipse.
  b. a partial solar eclipse.
  c. an annular solar eclipse.
  d. a penumbral lunar eclipse.
  e. an umbral lunar eclipse.