I took this photo on a recent trip down to Mammoth, CA, Hot Creek Ranch to be exact. If it wasn't for all the noise I'd be happy with it. What can I do to minimize the noise in the future so I don't loose any shots to it in the future.

40min exposure, Canon 20D, efs18-55, iso @100, apature set to about 9, no noise reduction turned on in the camera (should probably have had it on )