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doit_the_clown doit_the_clown
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7 years ago
What useful purpose did variable stars serve for Harlow Shapley in locating the galactic center?
A)   They are important spiral arm tracers and thus defined the shape of the Galaxy.
B)   Their brightness variations allowed accurate distances to be measured.
C)   They emit copious amounts of infrared radiation and are thus visible through interstellar dust that obscures visible light.
D)   They are concentrated in the galactic center and so defined its direction.
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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
7.prime7105
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Yesterday
Correct Slight Smile TY
megan.xo
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2 hours ago
Thanks
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