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Comet - Wikipedia
Comets - NASA Science
Comets: Everything you need to know | Space
1P/Halley - NASA Science
THE ORBIT OF A COMET - University of St Andrews
Comets: Facts - Science@NASA
What Is a Comet? | NASA Space Place – NASA Science for Kids
Comet | Definition, Composition, & Facts | Britannica
Why Comets Are Important - NASA Solar System Exploration
Comets explained: An essential guide to the snow cones of space