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Its fluorescence is due to excitation of the Hβ line in the nebula by the nearby prodigiously energetic O7 star, Xi Persei (also known as Menkib). [3] Infrared image showing xi Persei's interaction with the nebula including a (red) shock wave in the gas and dust (upper left) The California Nebula was discovered by E. E. Barnard in 1884.
NGC 2440 is a planetary nebula, one of many in our galaxy. Its central star, HD 62166, [1] is possibly the hottest known white dwarf, about 400,000°F(200,000°C). The nebula is situated in the constellation Puppis. It was discovered by William Herschel on March 4, 1790. He described it as "a beautiful planetary nebula of a considerable degree ...
Bubble Nebula in Barnard's Galaxy; California Nebula; Carina Nebula; Cave Nebula; Corona Australis Molecular Cloud; Cone Nebula; Crescent Nebula; Double Helix Nebula;
A deep marine layer is building across much of Southern California, the start of a cooler, wetter pattern. Light rain is possible through Saturday.
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It should come as no surprise that California is burning. On Wednesday, the National Oceanic and Atmospheric Administration (NOAA) reported that July was California's hottest month since record ...
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]
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