The star α Centauri C and the star Groombridge 34 B have the same apparent magnitude,but α Centauri C is 1.3 pc away from Earth and Groombridge 34 B is 3.5 pc away.What is the luminosity of Groombridge 34 B compared with α Centauri C? (See Figure 10-3,Comins,Discovering the Essential Universe,6th ed.)
A) 2.7 times brighter
B) 7.2 times fainter
C) 2.7 times fainter
D) 7.2 times brighter

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The Answer of The star α Centauri C and the star Groombridge 34 B have the same apparent magnitude,but α Centauri C is 1.3 pc away from Earth and Groombridge 34 B is 3.5 pc away.What is the luminosity of Groombridge 34 B compared with α Centauri C? (See Figure 10-3,Comins,Discovering the Essential Universe,6th ed.)
A) 2.7 times brighter
B) 7.2 times fainter
C) 2.7 times fainter
D) 7.2 times brighter

The Star α Centauri C and the Star Groombridge 34