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Home Q & A Board Science-Related Homework Help Physics
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doit_the_clown doit_the_clown
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7 years ago
What scientific method is used to observe the pulsation in size of a Cepheid variable star?
A)   This behavior has only been predicted theoretically and has never been detected.
B)   The observed perturbations in the orbits of planets around these stars
C)   The observed increase and decrease in the size of the star's image
D)   Doppler shift of absorption lines in its spectrum
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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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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discovererdiscoverer
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7 years ago
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doit_the_clown Author
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7 years ago
Just got PERFECT on my quiz
Tim0301
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Yesterday
This helped my grade so much Perfect
sakoon
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2 hours ago
Brilliant ツ
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