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doit_the_clown doit_the_clown
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7 years ago
A particular star cluster contains stars all with the same apparent magnitude of +6. Near the cluster (and at the same distance from the Earth) is a single star with an apparent magnitude of +1. The star's brightness appears to be the same as the collective brightness of the entire cluster. How many stars are in this cluster?

(a)   100 stars.
(b)   6 - 1 = 5 stars.
(c)   6 x 2.512 = 15 stars.
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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discovererdiscoverer
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doit_the_clown Author
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7 years ago
Correct Slight Smile TY
kamikazekota
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Yesterday
this is exactly what I needed
jasonbourne
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2 hours ago
Smart ... Thanks!
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