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doit_the_clown doit_the_clown
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7 years ago
The observation by Hubble that demonstrated for the first time that the Andromeda “nebula” was at a very large distance from the Sun, and outside our Galaxy, was
A)   that Cepheid variable stars appeared to be very faint in the “nebula.”
B)   that the “nebula” appeared to be rotating night by night around a center that was not the center of our Galaxy.
C)   that stars with characteristics similar to those of our Sun appeared to be absent in this “nebula.”
D)   that globular clusters appeared to be distributed in a halo around the “nebula,” a sure sign of a separate galaxy.
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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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discovererdiscoverer
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7 years ago
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doit_the_clown Author
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7 years ago
this is exactly what I needed
jamiebonf99
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Yesterday
You make an excellent tutor!
Starfiew
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2 hours ago
Brilliant ツ
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