Abstract
Close to the edge of our Solar System is a cloud containing many tiny objects only a few kilometers in diameter. Even though their number has been estimated to be as large as ~1013, their total mass is still negligible compared to that of the major planets. Their existence would go unnoticed were it not that, from time to time, some of them are gravitational by pertured and move inward, towards the Sun, and can then be observed as comets. Several space missions have been aimed uniquely at comets, among them the first European deep space mission, Giotto. Rosetta, a cornerstone mission of the Horizon 2000 program of the European Space Agency (ESA), is one of several comet missions being planned for the first decade of the twenty-first century.
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