If you look out at a clear night sky with the unaided eye,the faintest stars you can see have magnitudes around:
A) -6.
B) 0.
C) +6.
D) +12.

Question

Quizplus · Accepted Answer

The magnitude scale for stars is logarithmic, meaning that each increment of 1 in magnitude corresponds to a factor of approximately 2.5 in brightness. Thus, a star with a magnitude of +6 is approximately 100 times fainter than a star with a magnitude of 0 (which is defined as the magnitude of Vega). The faintest stars visible to the unaided eye under ideal conditions have magnitudes around +6.

If You Look Out at a Clear Night Sky with the Unaided