The Main Difference Between Cepheid Stars and RR Lyrae Stars

question 39

Multiple Choice

The main difference between Cepheid stars 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 Cepheids
• D) their pulsation mechanisms
• E) that Cepheids obey a period-luminosity relation, but RR Lyraes do not

---

Definitions:

Too Narrow

A criticism often directed at definitions or concepts suggesting they are overly restrictive and exclude relevant elements or aspects.

Counterexample

A specific instance that proves a definition wrong.

Atheist

An individual who does not believe in the existence of a god or gods.

Referents

The objects or concepts that a word or phrase denotes or stands for.