The Main Difference Between Cepheid Variable Stars and RR Lyrae

question 20

Multiple Choice

The main difference between Cepheid variable stars and RR Lyrae stars is

• A) their pulsation mechanisms.
• B) their masses.
• C) that Cepheids form at much greater distances from Earth.
• D) that RR Lyrae were discovered much earlier than Cepheids.

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Definitions:

Economic Theory

A set of principles and models that attempts to explain the relationships among economic variables and to predict future economic outcomes.

Realistic Assumptions

Assumptions made in economic models that aim to closely reflect actual conditions and behaviors in the real world.

Mathematical Terms

Mathematical terms are the specialized vocabulary used to describe concepts, operations, and properties in the field of mathematics.

Scientific Method

A systematic and logical approach to discovering how things in the universe work, based on making observations, forming a hypothesis, conducting experiments, and drawing conclusions.