Linked from

The 4 pages that link to Comet Hyakutake, each with the reason it gives.

• Hydrogen cyanideBroader topic: Astronomers detected hydrogen cyanide in its coma.

• Comet tailBroader topic: Its exceptionally long ion tail showed how far solar-wind-driven material can extend.

• Long-period cometBroader topic: Its close approach produced a prominent tail and unusually detailed observations.