The Main Difference Between Classical Cepheids and RR Lyrae Stars

question 78

Multiple Choice

The main difference between classical Cepheids and RR Lyrae stars is

• A) their masses.
• B) that Cepheids form at much greater distances from Earth.
• C) that RR Lyrae were discovered much earlier than classical Cepheids.
• D) their pulsation mechanisms.
• E) that classical Cepheids obey a period-luminosity relation, but RR Lyrae do not.

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