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Add gallery of well known nebulae
*[[Dark nebulae]] - Also called molecular clouds, these nebulae are characterised by interstellar dust in the foreground, obscuring stars or a bright nebula in the background.<ref name=britannica-dark>[https://www.britannica.com/topic/molecular-cloud Molecular Clouds] from britannica.com</ref> Some times called absorption nebulae, dark nebulae tend to be very dense and cold. Due to their dark nature, they can only really be seen via far-infrared and [[microwave]] techniques and have a temperature of 7-15 K.<ref name=britannica-dark/> Well known examples include the [[Horsehead nebula]] and the [[Coalsack nebula]].
*[[Dark nebulae]] - Also called molecular clouds, these nebulae are characterised by interstellar dust in the foreground, obscuring stars or a bright nebula in the background.<ref name=britannica-dark>[https://www.britannica.com/topic/molecular-cloud Molecular Clouds] from britannica.com</ref> Some times called absorption nebulae, dark nebulae tend to be very dense and cold. Due to their dark nature, they can only really be seen via far-infrared and [[microwave]] techniques and have a temperature of 7-15 K.<ref name=britannica-dark/> Well known examples include the [[Horsehead nebula]] and the [[Coalsack nebula]].
*[[Supernova]] remnants - These are the remnants of supernovae, composed of gas emitted during the supernova explosion.<ref name=seds-supernova>[http://www.messier.seds.org/snr.html Supernova Remnants (SNR's)] from messier.seds.org</ref> They are often large and impressive. Only a handful have been observed in the [[Milky Way]], but others have been seen in other [[galaxies]]. Examples include the [[Crab Nebula|Crab nebula]] and [[SN 1604]].
*[[Supernova]] remnants - These are the remnants of supernovae, composed of gas emitted during the supernova explosion.<ref name=seds-supernova>[http://www.messier.seds.org/snr.html Supernova Remnants (SNR's)] from messier.seds.org</ref> They are often large and impressive. Only a handful have been observed in the [[Milky Way]], but others have been seen in other [[galaxies]]. Examples include the [[Crab Nebula|Crab nebula]] and [[SN 1604]].
==Gallery==
Bellow are some images of well known nebulae.
<gallery>
File:Hubble Crab Nebula.JPG|[[Crab Nebula]]
File:Lagoon Nebula.jpg|[[Lagoon nebula]]
File:Eagle Nebula from ESO.jpg|[[Eagle nebula]]
File:600px-Orion Nebula - Hubble 2006 mosaic 18000.jpg|[[Orion nebula]]
File:NGC 2244 Rosette Nebula.jpg|[[Rosette nebula]]
File:Trifid.nebula.arp.750pix.jpg|[[Trifid nebula]]
File:Catseye-big.jpg|[[Cat's eye nebula]]
File:NGC7293 (2004).jpg|[[Helix nebula]]
File:M57 The Ring Nebula.JPG|[[Ring nebula]]
File:Boomerang HST big.jpg|[[Boomerang nebula]]
File:Barnard 33.jpg|[[Horsehead nebula]]
File:Snake Nebula.jpg|[[Snake nebula]]
</gallery>
==External links==
==External links==