The distance between starts is usually measured in
a. light-years
b. kilometers
c. astronomical units
d. miles

physical properties used to measure stars include
a. mass
b. brightness
c. size
d. all of the above

an h-r diagram
a. is a map of the positions of the stars
b. graphs stars according to their size and distance
c. lists every known star
d. graphs a sample of stars according to surface temperature an absolute brightness

the apparent change in position of an object with respect to a distant background is
a. light-year
b. parallax
c. luminosity
d. absorption