Back Hillswolk Afrikaans سحابة هيلز Arabic Воблака Хілса Byelorussian Núvol de Hills Catalan Hillsův oblak Czech Hills-Wolke German Nube de Hills Spanish Hillsen hodeia Basque ابر هیل Persian Hillsin pilvi Finnish
In astronomy, the Hills cloud (also called the inner Oort cloud[1] and inner cloud[2]) is a theoretical vast circumstellar disc, interior to the Oort cloud, whose outer border would be located at around 20,000 to 30,000 astronomical units (AU) from the Sun, and whose inner border, less well defined, is hypothetically located at 250–1500 AU,[citation needed] well beyond planetary and Kuiper Belt object orbits—but distances might be much greater. If it exists, the Hills cloud contains roughly 5 times as many comets as the Oort cloud.[3]
- ^ see Oort cloud
- ^ Villemin, Gérard. "Astronomie, astéroïdes et comètes" (in French).
- ^ Duncan, Martin J.; Quinn, Thomas; Tremaine, Scott (1987). "The Formation and Extent of the Solar System Comet Cloud". The Astronomical Journal. 94: 1330. Bibcode:1987AJ.....94.1330D. doi:10.1086/114571.