Who first used RR Lyrae variable stars to determine distances in our Milky Way Galaxy?
A) Henrietta Leavitt
B) Edwin Hubble
C) John Glenn
D) Carl Sagan
E) Harlow Shapley

Question

Quizplus · Accepted Answer

Harlow Shapley was the first to use RR Lyrae variable stars to measure distances in our Milky Way Galaxy. He used these stars as indicators for the size and shape of the galaxy, and his measurements provided the first accurate estimate of the size of the Milky Way.

Who First Used RR Lyrae Variable Stars to Determine Distances