title: SEASONAL CHANGES ON PLUTO
abstract: Due to the elongated orbit, Pluto's surface receives 2.8 times more heat at perihelion than at aphelion. This causes strong changes in its atmosphere and surface. It was previously believed that when Pluto is at aphelion, the entire atmosphere freezes and falls to the surface. However, refinements to the initial models suggest that Pluto has a noticeable atmosphere throughout the year. The last passage of the perihelion points by Pluto took place on September 5, 1989. And practically before this
journal: DÉBATS SCIENTIFIQUES ET ORIENTATIONS PROSPECTIVES DU DÉVELOPPEMENT SCIENTIFIQUE