Stars are so ridiculously far away that no matter how massive or blown out of proportion they may be, to us they look like points. Magnify a point, and it's still just a point.
That means that, unlike objects that cover an area, the light from a star does not get spread out as you magnify the image. All the light from the star stays inside the point.
However... as you increase magnification, the background skyglow does get spread out, which means the background gets darker and the star stays bright. This is a nice way of increasing the contrast on stars, and sometimes making fainter stars more visible.
That means that, unlike objects that cover an area, the light from a star does not get spread out as you magnify the image. All the light from the star stays inside the point.
However... as you increase magnification, the background skyglow does get spread out, which means the background gets darker and the star stays bright. This is a nice way of increasing the contrast on stars, and sometimes making fainter stars more visible.
Just remember, this works until you reach the maximum magnification of the scope, which is the same number as the diameter of the scope in millimeters. When you exceed that magnification (or the limits of the atmosphere), the stars start to spread out and dim down just like everything else.
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