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Ison: The comet of the century - BBC News
Comets: An Omen of Disaster? - A Learning Family
The World of Comets by Emily Esarey
Fun Comet Facts for Kids
Astronomers Think They Know Where Rosetta's Comet Came From - Universe
What are Comets and how are they formed?
Comets explained for everyone. Facts, Types, and Parts. - Little Astronomy
What is the Difference Between a Comet and an Asteroid?