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Coma (comet) - Wikipedia
Comets: Facts - Science@NASA
Comets: Everything you need to know | Space
Comet - Wikipedia
Coma | comet | Britannica
Comet | Definition, Composition, & Facts | Britannica
Why Comets Are Important - NASA Solar System Exploration
Parts of a Comet - Science Notes and Projects
What Is a Comet? | NASA Space Place – NASA Science for Kids
ESA Science & Technology - Catching up with the comet's coma