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:Seems someone added the two planets in the zoom-out, which isn't entirely right, as they're a good way outside the nebula. --[[User:Serenity|Serenity]] 11:41, 29 December 2007 (CST) | :Seems someone added the two planets in the zoom-out, which isn't entirely right, as they're a good way outside the nebula. --[[User:Serenity|Serenity]] 11:41, 29 December 2007 (CST) | ||
:Good catch Isidis | :Good catch Isidis and welcome to the wiki! Actually there are many types of nebulae: | ||
:*'''Ejection Nebulae''' - Formed by the ejection of materials from low-mass stars in the later stages of their lives (our own sun is a low-mass star, and will become one of these someday). The gas emits light because it is still hot. Usually referred to as a planetary nebula, but this is a misnomer. | :*'''Ejection Nebulae''' - Formed by the ejection of materials from low-mass stars in the later stages of their lives (our own sun is a low-mass star, and will become one of these someday). The gas emits light because it is still hot. Usually referred to as a planetary nebula, but this is a misnomer. | ||
:*'''Supernova | :*'''Supernova Remant''' - Same principle, just with a high-mass star. These stars usually produce a much hotter and much cooler looking nebula. | ||
:Most gas in the galaxy is created by stars, with a small exception for the small amount of gas still left over from the | :Most gas in the galaxy is created by stars, with a small exception for the small amount of gas still left over from the big bang. In the meantime, the gas just floats around the galaxy in streams. The gas itself is usually too cold to emit light, unless it's acted on in some way by a star, through either reflection or ionization: | ||
:*'''Reflection Nebulae''' - Only visible because light from a nearby star is being reflected against a pocket of gas in a star-forming region, usually in an open cluster. These are usually blue, because the stars that form in star-forming regions are very massive, and therefore very blue. | :*'''Reflection Nebulae''' - Only visible because light from a nearby star is being reflected against a pocket of gas in a star-forming region, usually in an open cluster. These are usually blue, because the stars that form in star-forming regions are very massive, and therefore very blue. | ||
:*'''Dark Nebulae''' - A black nebula, only visible because a dense pocket of cold gas blocks some other light source. These depend on your perspective, so seeing a dark nebula is a function of your location in the galaxy. | :*'''Dark Nebulae''' - A black nebula, only visible because a dense pocket of cold gas blocks some other light source. These depend on your perspective, so seeing a dark nebula is a function of your location in the galaxy. | ||
:*'''Emission Nebulae''' - A dense pocket of gas is ionized by the photons from nearby stars, causing the gas to emit its own photons. These nebulae are usually red because the act of ionization in this sense is a | :*'''Emission Nebulae''' - A dense pocket of gas is ionized by the photons from nearby stars, causing the gas to emit its own photons. These nebulae are usually red because the act of ionization in this sense is a cool process. Most of the light emitted from these nebulae is in the infrared, and for that reason, red is the predominant color in the visible light spectrum. I think this is the best candidate for the Ionian Nebula.--[[User:OrionFour|OrionFour]] 13:42, 29 December 2007 (CST) | ||