planetary nebula
91astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… …
92star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …
93NGC 2818 — Observation data (Epoch J2000.0 [1]) Right ascension 09h 16m 01.656s [1] …
94NGC 7662 — A Hubble Space Telescope (HST) image of NGC 7662. Credit: HST/NASA/ESA.[1] Observation data (Epoch J2000) …
95Milky Way Galaxy — Large spiral galaxy (roughly 150,000 light years in diameter) that contains Earth s solar system. It includes the multitude of stars whose light is seen as the Milky Way, the irregular luminous band that encircles the sky defining the plane of… …
96Protoplanetary disk — A protoplanetary disk (or proplyd) is a rotating circumstellar disk of dense gas surrounding a young newly formed star, a T Tauri star or Herbig star. The protoplanetary disk may be considered an accretion disk because gaseous material may be… …
97Messier 22 — Core of Messier 22 Observation data (J2000 epoch) Class VII C …
98List of NGC objects (3001–4000) — Image of the spiral galaxy NGC 3244 was taken with the help of the President of the Czech Republic, Václav Klaus, during his visit to ESO s Paranal Observatory[1] This is a list of objects 3001 4000 in the New General Catalogue (NGC). The… …
99H II region — An H II region (also known as emission nebula) is a cloud of glowing gas and plasma, sometimes several hundred light years across, in which star formation is taking place. Young, hot, blue stars which have formed from the gas emit copious amounts …
100History of Solar System formation and evolution hypotheses — Capture theory redirects here. For the solar capture theory, see this article s section on Solar System formation. For the lunar capture theory, see this article s section on lunar formation. Ideas concerning the origin and fate of the world date …
