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

Name: 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
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Harlow Shapley first used RR Lyrae variable stars as standard candles to determine the size of our Milky Way galaxy, in the early 1900s.

Who First Used RR Lyrae Variable Stars to Determine Distances