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doit_the_clown doit_the_clown
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7 years ago
An astronomical unit (AU) is
A)   a unit of time equal to the time taken for light to travel from the Sun to the Earth.
B)   a standard unit of length, defined as the wavelength of light from krypton gas.
C)   a unit of length, the average distance between the Sun and the Earth.
D)   a unit of mass equal to one solar mass.
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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papachulopapachulo
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7 years ago
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7 years ago
Thank you, thank you, thank you!
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