principal planets
41Formation et évolution du système solaire — Vue d artiste d un disque protoplanétaire. La formation et l évolution du système solaire sont déterminées par un modèle aujourd hui très largement accepté et connu sous le nom d « hypothèse de la nébuleuse solaire ». Ce modèle fut… …
42meteor and meteoroid — ▪ astronomy Introduction respectively, a glowing streak in the sky (meteor) and its cause, which is a relatively small stony or metallic natural object from space (meteoroid) that enters Earth s atmosphere and heats to incandescence. In modern… …
43Urano (planeta) — Para otros usos de este término, véase Urano. Urano …
44earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …
45atmosphere, evolution of — Introduction the development of Earth s (Earth) atmosphere across geologic time. The process by which the current atmosphere arose from earlier conditions is complex; however, evidence related to the evolution of Earth s atmosphere, though… …
46literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… …
47physical science — physical scientist. 1. any of the natural sciences dealing with inanimate matter or with energy, as physics, chemistry, and astronomy. 2. these sciences collectively. [1835 45] * * * Introduction the systematic study of the inorganic world …
48Planetary objects proposed in religion, astrology, ufology and pseudoscience — This article is about non scientific hypothetical planetary objects. For scientifically accepted hypothetical planetary objects, see Hypothetical planet (disambiguation). For fictional planets, see Planets in science fiction. There are a number… …
49Minor planet moon — 243 Ida and its moon Dactyl as imaged by the Galileo spacecraft in 1993 …
5099942 Apophis — Discovery[2] Discovered by Roy A. Tucker David J. Tholen Fabrizio Bernardi Discovery site Kitt Peak …
