They create an outerspace picture being as creative as they want to be (aliens, etc. After they are finished with their drawing the color it in using oil pastels, then paint the whole paper black to make it look like everything is floating in space.
Just looking at pictures of the stars and planets in the galaxy gives you a wonderous feeling. I put together a Power Point presentation of the galaxy, and the kids were in awe of the beauty of outer space. The Hubble .