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

  7. Halley's Comet begins its 38-year journey back toward Earth tonight

  8. 1P/Halley - NASA Science

  9. NASA Researchers Discover More Dark Comets

  10. Hubble Confirms Largest Comet Nucleus Ever Seen - Science@NASA