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einsteindude einsteindude
wrote...
Posts: 5058
9 years ago
Cepheids are types of stars that regularly change how bright they are over a period of a few
A) days.
B) months.
C) year.
D) decades.
Textbook 
Conceptual Physical Science

Conceptual Physical Science


Edition: 6th
Authors:
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bSharpbSharp
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Posts: 3706
9 years ago
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wrote...
4 years ago
thank you
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