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doit_the_clown doit_the_clown
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7 years ago
Determination of the distance to the Andromeda “nebula” (which finally resolved the Curtis-Shapley debate on the nature of “spiral nebulae”) was carried out by Hubble by observing
A)   pulsars.
B)   Cepheid variable stars.
C)   the Doppler shift of stars in the nebula.
D)   the main sequence of stars in the “nebula.”
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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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7 years ago
You make an excellent tutor!
Transonic
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Thanks for your help!!
sudenzia
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Helped a lot
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