I've been working on various database portal projects for the last ten years at work that all deal with the same general type of data. I've been wanting to work with different types of data and thought about working with scientific data for a change. I'm mainly looking for a hobby that I can use to expand my scientific knowledge. My general interest lies in astronomy but, I wouldn't limit myself to that if the data were interesting enough. I'm assuming that there are datasets on the internet that could be downloaded but, I have no idea where to look. Any ideas?