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doit_the_clown doit_the_clown
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7 years ago
What was the implication of the observation by Edwin Hubble that the Cepheid variable stars he measured in the Andromeda “nebula” appeared to be very faint compared with what was expected?
A)   The observed period was affected by the intense gravitational field of the “nebula” as predicted by general relativity, leading to incorrect luminosity determination.
B)   The Andromeda “nebula” was very far away and was in fact a galaxy.
C)   He had discovered a new class of intrinsically faint Cepheid variable stars.
D)   Dust and gas in the “nebula” had severely reduced the light from these stars.
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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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papachulopapachulo
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7 years ago
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doit_the_clown Author
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I appreciate what you did here, answered it right Smiling Face with Open Mouth
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