The Star Betelgeuse Appears Red; the Star Rigel Appears Blue

question 54

Multiple Choice

The star Betelgeuse appears red; the star Rigel appears blue. What accounts for this difference?

• A) Betelgeuse and Rigel have different chemical compositions.
• B) Betelgeuse is moving away from Earth, Rigel is moving toward Earth.
• C) Betelgeuse is moving toward Earth, Rigel is moving away from Earth.
• D) The surface of Betelgeuse is hotter than the surface of Rigel.
• E) The surface of Betelgeuse is cooler than the surface of Rigel.

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