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

  2. Comets: Everything you need to know | Space

  3. Elliptic orbit - Wikipedia

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

  5. Orbital eccentricity - Wikipedia

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

  7. Why Comets Are Important - NASA Solar System Exploration

  8. Halley's Comet - Wikipedia

  9. Comet: Definition, Tails, Facts, Orbit, Visibility, Difference

  10. Comet Orbits | Solar System | Space FM