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  1. What Is a Comet? | NASA Space Place – NASA Science for Kids

  2. Why do comets have such eccentric orbits? | Astronomy.com

  3. Comets: Everything you need to know | Space

  4. Halley's Comet - Wikipedia

  5. Why Comets Are Important - NASA Solar System Exploration

  6. Elliptic orbit - Wikipedia

  7. THE ORBIT OF A COMET - University of St Andrews

  8. The Comet's Tale: Orbits - University of California, Berkeley

  9. Comet - Wikipedia

  10. Comet Orbits | Solar System | Space FM