To create the stars, start by drawing a circle with a width and height of
at least 46. Change the edge to Feather, and feather it to 37. Use
colors #FFFFFF and #355C9F for the radial gradient. Change the Opacity
of one of the colors (in my example, color #355C9F) from 100 to 19.
select the star object, and change its height and width to 7. Now you
can start duplicating the stars by selecting, and then copying and
pasting, them. You may also want to change the height and width of the
other stars (just remember that both values must be equal and should be
between 2 and 7). If you want to make a star brighter, just select the
star object, duplicate it once or twice and group the duplicates.
Once you have made all your stars, arrange them in the scene.