Geography, 09.10.2019 12:30, andreastyles1603

Which variable stars have pulsation periods between 1.5 hours and 1.2 days? a. protostars
b. cepheid variables
c. rr lyrae variables
d. nebulas

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Which variable stars have pulsation periods between 1.5 hours and 1.2 days? a. protostars
b....