system
Given the following post, respond as if you're commenting on Reddit:
human
Why do all stars almost look the same size when they are so far away and apart?

Follow up:
Should not the suns ratio to the stars be diffrent?
gpt
The vast majority of stars are either so far away or so small (relative to their distance) that their light simply can't be resolved as more than a single point of light. Only stars which are large enough or close enough can be resolved to more than a single point, and even these stars have apparent diameters on the order of <60 milliarcseconds  
(1 milliarcsecond = 1/3,600,000th of a degree; 1 arcsecond is 1/60th of an arcminute which is 1/60th of a degree).

As an example, Proxima Centauri, the closest star to the Sun, has 1/7th the radius of the sun, but is just over 4 light years away, which is pretty close in astronomical contexts. It has been resolved with a diameter of about 1 mas, whereas a star like Betelgeuse which has a radius 630 times that of the Sun but is around 650 light years away has only been resolved to a angular diameter of about 50 mas.