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A nebula that is visible to the human eye from Earth would appear larger, but no brighter, from close by. [6] The Orion Nebula, the brightest nebula in the sky and occupying an area twice the angular diameter of the full Moon, can be viewed with the naked eye but was missed by early astronomers. [7]
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 ...
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 ...
IRAS 19024+0044, also known informally as the Starfish Nebula [1], is a large protoplanetary nebula that is located in the constellation Aquila at a distance of approximately 11,000 light-years from the Milky Way. [2] [3] The central star of the nebula is approaching the final stage of its
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Nebula Award, a Science Fiction and Fantasy Writers of America (SFWA) award recognizing the best works of science fiction or fantasy published in the United States; Nebula Awards (China), awarded yearly for Chinese-language works of science fiction published in any country