What I would suggest, Jessie, is that you build yourself a tracking platform so that you can track the objects you want to photograph and also so that the stars don't trail.....unless, of course, you want to take a star trail piccie
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Here's a good platform you can knock up for yourself....
http://www.garyseronik.com/?q=node/52
Then, what you can do, is lower the ISO rating you're shooting at, as you'll be tracking the sky and won't need to shoot so fast to stop any trailing of the stars or to pickup your subjects quickly. Also helps to reduce noise in your piccies.