Why do other stars look much smaller than the Sun when viewed from Earth?

Question

A.
They are much farther away than the Sun.
B.
Their luminosities are much less than the Sun's.
C.
Their temperatures are much lower than the Sun's.
D.
They have diameters much smaller than the Sun's.

Answer 1

The correct answer is:

A. They are much farther away than the Sun.

While some stars may indeed have lower luminosities or smaller diameters, the primary reason stars appear much smaller than the Sun when viewed from Earth is the vast distances that separate us from those stars. The Sun is much closer to us than any other star, which is why it appears so much larger in the sky.