Using a good pair of binoculars, you observe a section of the sky where there are stars of many different apparent brightnesses. You find one star that appears especially dim. This star looks dim because it is:
A) very far away
B) very low luminosity
C) radiating most of its energy in the infrared region of the spectrum
D) partly obscured by a cloud
E) it could be more than one of the above; there is no way to tell which answer is right by just looking at the star

Question

Quizplus · Accepted Answer

A star can appear dim for multiple reasons, including being very far away, having low luminosity, radiating most of its energy outside the visible spectrum (such as in the infrared), or being obscured by interstellar matter. Without additional information, it's impossible to determine the exact reason from just observing its apparent brightness.

Using a Good Pair of Binoculars, You Observe a Section