Linked from
The 52 pages that link to Comet, each with the reason it gives.
Kuiper beltRelated: Kuiper belt objects are a source of short-period comets.
Planetary defenseRelated: Long-period comets can arrive with less warning than many asteroids.
Zodiacal lightRelated: Comets continually replenish dust that can contribute to the zodiacal cloud.
AstrochemistryRelated: Cometary molecules preserve clues to chemistry in the early Solar System.
MeteoroidRelated: Cometary activity releases debris that can become meteoroids.
MeteorRelated: Cometary debris supplies many meteoroids that encounter Earth's atmosphere.
Meteor showerRelated: Cometary activity sheds much of the debris that forms meteor streams.
Jan OortRelated: The paths of long-period comets provided evidence for Oort’s distant reservoir.
Night skyRelated: Bright comets can become conspicuous, changing features of the night sky.
Interplanetary dust cloudRelated: Cometary activity continually injects fine grains into the cloud.
Interplanetary mediumRelated: Comets replenish interplanetary dust and create streams of meteoroids.