Definición de Halley's comet en inglés:

Halley's comet

Saltos de línea: Hal¦ley's comet
A periodical comet with an orbital period of about 76 years, its reappearance in 1758-9 having been predicted by Edmond Halley. It was first recorded in 240 bc and last appeared, rather faintly, in 1985-6.

Definición de Halley's comet en: