@Luomu wrote:
This could be fixed by giving the sun a halo that stops getting smaller after certain distance. Or just fading the star out, right now the brightness of the star pixels stays the same at all distances.
I don't really have a good grasp of this: What should the sun look like from 8 AU away? Is it appropriate to decrease the brightness at all? @Brianetta would you perhaps know :)
Radiation, including sunlight, obeys the inverse square law. The amount of radiation falling on a surface from a point light source is inversely proportional to the square of the distance. If you have two otherwise identical cameras, and one is twice as far away, it will get a quarter of the light entering its aperture. Three times as far means a ninth of the light.
Note that while this diminishes very rapidly when close to the light source, it approaches an asymptote with distance, which is why you'll never travel so far from a star that you can't see it any more.