On a night when a human eye can see a fourth magnitude star, a 60mm telescope, with 100× the surface area as our pupil, would be able to just barely detect

A) ninth magnitude Barnard's Star.
B) eighth magnitude Uranus.
C) seventh magnitude Titan, Saturn's largest moon.
D) eleventh magnitude Tethys, Saturn's second largest moon.
E) thirteenth magnitude Pluto.


A

Physics & Space Science

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