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doit_the_clown doit_the_clown
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7 years ago
To an astronomer, what is a “standard candle”?
A)   A standard light source that is placed in a telescope, to which the brightness of stars and other objects can be compared
B)   Any galaxy whose redshift has been measured accurately
C)   Any type of object whose absolute magnitude or intrinsic brightness is known
D)   An accurately defined brightness scale for stars and galaxies, such as the magnitude scale
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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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7 years ago
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doit_the_clown Author
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7 years ago
Brilliant ツ
loki1345
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Yesterday
this is exactly what I needed
riptide
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2 hours ago
Correct Slight Smile TY
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