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doit_the_clown doit_the_clown
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7 years ago
What is a Cepheid variable star?
A)   One of several classes of stars that pulsate randomly in brightness
B)   A low-mass, horizontal-branch star that pulsates regularly in brightness
C)   A star that normally remains constant in brightness but occasionally flares up in brightness by several magnitudes
D)   A high-mass star that pulsates regularly in brightness
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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7 years ago
Good timing, thanks!
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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2 hours ago
You make an excellent tutor!
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