The World Wide Web has become an essential part of many astronomers' lives. It is a rich source of all manner of information and news. Below, we have tried to gather together some of the most useful links. Such a list has no hope of being comprehensive, and you'll doubtless discover countless other helpful links, but here are some that we find helpful. Space Agencies The European Space Agency (ESA) NASA General Sites Planetarium.com has some excellent links Colin's Observational Astronomy Site is a massive, and very useful observing resource. The Space Images Archive have loads of great space images. David A. Hardy's space art site has some incredible images