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10 cards from this deck
Rate of light energy released or power output of a star
Watts (WWW)
Power received from a star per unit area on Earth
W m−2W \, m^{-2}Wm−2
Inverse square law
One-fourth as much
Measure of how bright an object appears from Earth
Brighter star
Brightness change by factor of ∼2.51\sim 2.51∼2.51
100-fold difference in intensity
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