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visits member for 9 months
seen Jul 28 at 3:29

Feb
17
awarded  Scholar
Feb
17
awarded  Supporter
Feb
17
accepted How is the magnitude of a star measured?
Feb
7
awarded  Student
Feb
7
awarded  Teacher
Feb
7
answered How can we tell that the Milky Way is a spiral galaxy?
Feb
7
asked How is the magnitude of a star measured?