Science fair projects are meant to solve problems, not to show how something works. I’d really like to do a science fair project in the astronomy category but I can’t think of any problems that could be solved by me in astronomy. If you have any suggestions, I would greatly appreciate seeing them.
Are you kidding? Astronomy is perhaps the one science left where the amateurs can contribute as much as the professionals, indeed many professionals rely on information e-mailed to them by amateurs.
A strong pair of binoculars and a lot of patience is all you need to discover your own comet. New comets are being discovered on an almost daily basis. Once you have found a comet with your binoculars (you can easily spot the ones near the earth as they are bright enough to be seen with binoculars and have a distinct fuzzy tail thrown out by solar winds) then you can look up the location on an astronomical web site (there are many) to see if it has already been catalogued if it hasn’t e-mail some professionals and see if they can independently verify your observation and you not only have your science project but you have made a contribution to the astronomical community.
That’s something simple anybody at any age can do, if you want something more technically complex then you could register with the Slooh web-site and have a chat with professional astronomers about your question.
While you’re there take a good look at their awesome telescopes.