A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way. The Andromeda Galaxy, for instance, was once referred to as the Andromeda Nebula (and spiral galaxies in general as "spiral nebulae") before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble and others. Most nebulae are of vast size, some are hundreds of light years in diameter. A nebula that is barely visible to the human eye from Earth would appear larger, but no brighter, from close by. The Orion Nebula, the brightest nebula in the sky that occupies a region twice the diameter of the full Moon, can be viewed with the naked eye but was missed by early astronomers. Although denser than the space surrounding them, most nebulae are far less dense than any vacuum created on Earth – a nebular cloud the size of the Earth would have a total mass of only a few kilograms. Many nebulae are visible due to fluorescence caused by embedded hot stars, while others are so diffuse they can only be detected with long exposures and special filters. Some nebulae are variably illuminated by T Tauri variable stars.
Milky Way - heaven unknown but liked
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Milky Way

Added 2 months ago by Makronos

63 1

Galaxy wow - galaxy on litters
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Galaxy wow

Added 3 months ago by MAJAMA


antimatter - man and antimatter, antimatter and man
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Added year ago by człowiek


wonders of nature - amazing wonders of nature and man
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wonders of nature

Added year ago by żaba


Abstraction - abstract tree in a sphere
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Added year ago by andi


nebulosa - nebulosa del granchio
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Added year ago by carla


galaxy tree - The picture shows a tree against the background of the night sky
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galaxy tree

Added year ago by Lil

117 1

granatowe niebo - granatowe niebo, blyskawica
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granatowe niebo

Added over a year ago by Iwona


zorza polarna - niebo,gwiazdy,kolory,zorza
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zorza polarna

Added over a year ago by wieslawa


Puzzle CS-NaPlusie.pl - Puzzle z CS-NaPlusie.pl zapraszam do zabawy.
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Puzzle CS-NaPlusie.pl

Added over a year ago by Szary.


Purple Sky - Purple Sky Wallpaper
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Purple Sky

Added over a year ago by angel


Manga Anime - Manga Anime Ładny Obrazek
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Manga Anime

Added over a year ago by Weronika


giuvan palestin - immensità dello spazio, stelle e quanto ltro
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giuvan palestin

Added over a year ago by giuvuan


galaktyczne puzzle! - śliczne zdięcie (chyba zdięcie)
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galaktyczne puzzle!

Added over a year ago by Galaxy :3


Mgławica Kraba - Zdjęcia z teleskopu Huble'a
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Mgławica Kraba

Added over a year ago by 123456789


Kolorowa Galaktyka - Piękna, Kolorowa Galaktyka
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Kolorowa Galaktyka

Added over a year ago by Smerfetttka^^


explosion-cropped - explosion-cropped explosion
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Added over a year ago by Balduin