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respiratory system
(Encyclopedia)respiratory system: see respiration. ...portal system
(Encyclopedia)portal system: see circulatory system. ...exoplanet
(Encyclopedia)exoplanet or extrasolar planet, a planet located outside the solar system. See planet; planetary system. ...nebular hypothesis
(Encyclopedia)nebular hypothesis: see solar system. ...tidal theory
(Encyclopedia)tidal theory: see solar system.protoplanet theory
(Encyclopedia)protoplanet theory: see solar system. ...encounter theory
(Encyclopedia)encounter theory, in astronomy, see solar system. ...Kitt Peak National Observatory
(Encyclopedia)Kitt Peak National Observatory, astronomical observatory located southwest of Tucson, Ariz.; it was founded in 1958 under contract with the National Science Foundation and is administered by the Assoc...Haleakala Observatories
(Encyclopedia)Haleakala Observatories häˌlāäˌkäläˈ [key], astronomical facilities located on the summit of Haleakala volcano, 10,023 ft (3,055 m), in Haleakala National Park, Maui island, Hawaii. Because of...planetesimal theory
(Encyclopedia)planetesimal theory plănˌĭtĕsˈəməl [key]: see solar system. ...Browse by Subject
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