Stars X and Y have the same temperature, but the radius of star X is 3 times larger than the radius of star Y. We conclude that:

Select one:

a. Star Y will appear brighter to an observer on Earth.

b. Star X will appear brighter to an observer on Earth.

c. The luminosity of star X is 9 times larger than the luminosity of star Y.

d. Star Y will appear more red to an observer on Earth.

e. The absolute magnitude of star X is 9 times larger than the absolute magnitude of star Y.

Star Z has absolute magnitude 1 and Star Y has absolute magnitude 4. We conclude that:

Select one:

a. Star Y is 3 times closer than star Z.

b. Star Y appears to us brighter than star Z.

c. Star Z appears to us brighter than star Y

d. In the H-R diagram, star Z will be closer to the top than star Y.

e. Star Z is 4 times closer than star Y.

Star S has apparent magnitude 1 and star K has apparent magnitude 4. We conclude that:

Select one:

a. Star K is 4 times brighter than star S.

b. Star K is 3 times brighter than star S.

c. Star S is 4 times brighter than star K.

d. None of the choices listed is correct.

e. Star S is 3 times brighter than star K.

Star S and Star K have the same tangential velocity, but Star S is closer to Earth. Which has the larger proper motion?

Select one:         

a. The answer cannot be determined from the information given.

b. Star K.

c. They both have the same proper motion.

d. Star S.