What Useful Purpose Did Variable Stars Serve for Harlow Shapley

What useful purpose did variable stars serve for Harlow Shapley in locating the galactic center?

A) Variable stars are important spiral arm tracers and thus defined the shape of the Milky Way Galaxy.
B) The brightness variations of variable stars allowed accurate distances to be measured.
C) Variable stars emit copious amounts of infrared radiation and are thus visible through interstellar dust that obscures visible light.
D) Variable stars are concentrated in the galactic center and so defined its direction.

Correct Answer:

Verified

Unlock this answer now
Get Access to more Verified Answers free of charge

Access For Free