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doit_the_clown doit_the_clown
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7 years ago
If stellar parallax as small as 0.01 arcsec can be measured using telescopes on the Earth to observe stars, to what distance does this correspond in space?
   A)  500 pc    B)  200 pc    C)  0.01 pc    D)  100 pc
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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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hyponoticahyponotica
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7 years ago
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7 years ago
You make an excellent tutor!
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Yesterday
Good timing, thanks!
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2 hours ago
Smart ... Thanks!
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