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A '''nebula''' (from [[Latin]]: "cloud" [1]; pl. nebulae or nebulæ, with ligature or nebulas) is an [http://en.wikipedia.org/wiki/Interstellar_cloud interstellar cloud] of dust, hydrogen gas, helium gas and [http://en.wikipedia.org/wiki/Plasma_(physics) plasma]. Originally nebula was a general name for any extended [[astronomical]] object, including [[galaxies]] beyond the [[Milky Way]] (some examples of the older usage [[survive]]; for example, the [http://en.wikipedia.org/wiki/Andromeda_Galaxy Andromeda Galaxy] was referred to as the Andromeda Nebula before galaxies were [[discovered]] by [http://en.wikipedia.org/wiki/Edwin_Hubble Edwin Hubble]). Nebulae often form star-forming regions, such as in the [http://en.wikipedia.org/wiki/Eagle_Nebula Eagle Nebula]. This nebula is depicted in one of NASA's most famous images, the "[http://en.wikipedia.org/wiki/Pillars_of_Creation Pillars of Creation]". In these regions the formations of gas, dust and other materials "clump" together to form larger [[mass]]es, which [[attract]] further [[matter]], and [[eventually]] will become big enough to form stars. The remaining [[materials]] are then believed to form [[planets]], and other planetary [[system]] objects.http://en.wikipedia.org/wiki/Nebula]

A '''nebula''' (from [[Latin]]: "cloud" [1]; pl. nebulae or nebulæ, with ligature or nebulas) is an [http://en.wikipedia.org/wiki/Interstellar_cloud interstellar cloud] of dust, hydrogen gas, helium gas and [http://en.wikipedia.org/wiki/Plasma_(physics) plasma]. Originally nebula was a general name for any extended [[astronomical]] object, including [[galaxies]] beyond the [[Milky Way]] (some examples of the older usage [[survive]]; for example, the [http://en.wikipedia.org/wiki/Andromeda_Galaxy Andromeda Galaxy] was referred to as the Andromeda Nebula before galaxies were [[discovered]] by [http://en.wikipedia.org/wiki/Edwin_Hubble Edwin Hubble]). Nebulae often form star-forming regions, such as in the [http://en.wikipedia.org/wiki/Eagle_Nebula Eagle Nebula]. This nebula is depicted in one of NASA's most famous images, the "[http://en.wikipedia.org/wiki/Pillars_of_Creation Pillars of Creation]". In these regions the formations of gas, dust and other materials "clump" together to form larger [[mass]]es, which [[attract]] further [[matter]], and [[eventually]] will become big enough to form stars. The remaining [[materials]] are then believed to form [[planets]], and other planetary [[system]] objects.[http://en.wikipedia.org/wiki/Nebula]

[[Category: Astronomy]]

[[Category: Astronomy]]