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doit_the_clown doit_the_clown
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7 years ago
Which type of telescope uses a lens as the main optical element?
A)   A radio telescope   C)   A Cassegrain telescope
B)   A Newtonian telescope   D)   A refracting telescope
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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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doit_the_clown Author
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7 years ago
Correct Slight Smile TY
Fleury
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Smart ... Thanks!
Ivansitospeed@g
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2 hours ago
Helped a lot
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