planetary boundary layer
81Asteroid-impact avoidance — Planetary defense redirects here. For defending against alien invasion in fiction, see alien invasion. Artist s impression of a major impact event. The collision between Earth and an asteroid a few kilometres in diameter releases as much energy… …
82Geology of Mars — Mars   Mars as seen by the Hubble Space Telescope Designations …
83Atmosphere of Jupiter — Cloud pattern on Jupiter in 2000 The atmosphere of Jupiter is the largest planetary atmosphere in the Solar System. It is mostly made of molecular hydrogen and helium in roughly solar proportions; other chemical compounds are present only in… …
84Sun — This article is about the star. For other uses, see Sun (disambiguation). The Sun …
85cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …
86History of the Earth — For the history of modern humans, see History of the world. Geological time put in a diagram called a geological clock, showing the relative lengths of the eons of the Earth s history The history of the Earth describes the most important events… …
87Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …
88Chicxulub crater — Imaging from NASA s Shuttle Radar Topography Mission STS 99 reveals part of the 180 kilometer (112 mi) diameter ring of the crater; clustered around the crater s trough are numerous sinkholes, suggesting a prehistoric oceanic basin in… …
89earth — /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… …
90Jupiter — This article is about the planet. For other uses, see Jupiter (disambiguation). Jupiter   …
