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This nebula was also observed by Johann Baptist Cysat in 1618. However, the first detailed study of the Orion Nebula was not performed until 1659 by Christiaan Huygens, who also believed he was the first person to discover this nebulosity. [11] In 1715, Edmond Halley published a list of six nebulae.
An ionized nebula powered by young, massive O-type stars. Ultraviolet photons from these hot stars ionize gas in the surrounding environment, and the nebular gas shines brightly in spectral lines of hydrogen and other elements. Because O-type stars have relatively short lifetimes (typically a few million years), the presence of an H II region ...
The Tesoro de la lengua castellana o española (Thesaurus of Castilian or Spanish Language) is a dictionary of the Spanish language, written by Sebastián de Covarrubias in 1611. It was the first monolingual dictionary of the Castilian (Spanish) language, [clarification needed ; see Talk page] with its lexicon defined in Spanish.
WordReference is an online translation dictionary for, among others, the language pairs English–French, English–Italian, English–Spanish, French–Spanish, Spanish–Portuguese and English–Portuguese. WordReference formerly had Oxford Unabridged and Concise dictionaries available for a subscription.
SpanishDict is a Spanish-American English reference, learning website, [1] and mobile application. [2] The website and mobile application feature a Spanish-American English dictionary and translator, verb conjugation tables, pronunciation videos, and language lessons. [3] SpanishDict is managed by Curiosity Media. [4]
Box Nebula NGC 6445: 1786 4.5 11.2 Sagittarius: Eye of Sauron Nebula M 1-42: 10 14 Sagittarius
LDN – (catalog) Lynds Dark Nebula, a catalog of dark nebulae; LDN – (celestial object) large dark nebula, a large, wispy nebula made of neutral brown hydrogen gas. LDS – (catalog) Luyten Double Star; LDSS3 — (spectrograph) Low Dispersion Survey Spectrograph, from Magellan 2 Clay Telescope at LCO. LEO – (astrophysics terminology) low ...
Category: Spanish dictionaries. 12 languages. ... Collins Spanish Dictionary; D. Diccionario biográfico español; Diccionario crítico etimológico castellano e ...