Halley’s Comet made its closest approach to earth yet in 1986. Edmond Halley discovered that certain similar comets had been seen in 1531, 1607, and 1682. He concluded the sightings were of the same comet. It was named in honor of him. The comet appears roughly every 77 years, approaching earth again mid-2061. Children can learn more about Halley’s Comet and comets in general at: Comets.