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doit_the_clown doit_the_clown
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7 years ago
“Standard candles,” which are important for finding distances to remote galaxies, are
A)   stars and other objects of known intrinsic brightness.
B)   standard laboratory light sources with which the brightness of a galaxy can be compared.
C)   standard bars of known length with which the size of a galaxy can be measured.
D)   heat sources used for calibrating infrared observations of galaxies.
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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