1987/09/30 by Fred L. Whipple · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Planetary Science and Exploration #Stellar, planetary, and galactic studies
paper · doi:10.1098/rsta.1987.0090
openalex publication_date 1987/09/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/15
Abstract This paper presents an elementary description of comets and their nature. It deals with the contribution from comets to the solid particles that produce the Zodiacal Light and discusses the possibility that some comets in short-period orbits may degenerate into asteroids. The evidence suggests that this may well have happened for the Trojan and other of the outer asteroids but that the near-Earth asteroids and the meteorites are largely not cometary in origin. The last section of the paper deals with the possible nature of comets and their origin such that some might become superficially indistinguishable from asteroids. Space missions are clearly needed, to answer some of these basic questions.