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

Question

Quizplus · Accepted Answer

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

On a Night When a Human Eye Can See a Fourth