really? levels shouldnt do that, it isnt a random thing. are you applying it to straight noise? regardless, it doesnt really matter, because you arent meant to get the appearance of the stars from there. from there you need to apply areas of light and dark by using dodge and burn on a huge soft brush, as well as cloning and rotating and resizing.
also, to get a more interesting starfield over the top of that, get a few small but feature size stars on a layer, and then duplicate it. rotate, resize, whatever it, and then merge down. rinse and repeat about 10-30 times and you have yourself a feature starscape over your noise starscape. then you just add a cloud layer on overlay and its all nice and pretty, ready for some planets.
Bet your classmates were all amazed seeing you work on this...I occasionally experimented making planets or other quick things in my classes at a course I did too when I was bored or had some free time nice colours!
eh, looks like something I'd find in the trash somewhere...hehe
pretty wicked stuff, even though you didn't spend a lot of time on this one, I like it a lot... my preference on your pieces is the ones that don't have any people or anything like that: just space and celestial bodies.
The simple things in this help, such as the small moon (I'm assuming) on the right. If that wasn't there then the piece wouldn't quite have the same sense of "balance" it has at the moment. Also, having the heavy lighting on the right side puts emphasis on the fact that the moon is there without it being overwhelmed by the planet