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doit_the_clown doit_the_clown
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7 years ago
T Tauri stars are at what stage of stellar evolution?
A)   Main-sequence, or “middle age”
B)   Horizontal-branch phase
C)   Early phases: after the formation of a protostar but before the main sequence
D)   Post–main-sequence before helium shell flash
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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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