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'''M87''' (NGC 4486, Virgo A) is a [[galaxy]] situated in the Virgo cluster, in the [[constellation]] of Virgo and the 87th item in the Messier catelogue.<ref name=messierSeds>[http://www.messier.seds.org/m/m087.html M87] from messier.seds.org, the Students for the Exploration and Development of Space</ref> It is one of the largest galaxies known, containing trillions of [[star]]s<ref name=esa>[http://sci.esa.int/hubble/43215-m87/ M87] from sci.esa.int</ref> It is well known for its jet that extends for thousands of light years from its centre. M87 is an [[elliptical galaxy]], with classification E0 or E1 meaning it is very nearly spherical and is thought to have a mass at least one trillion times that of the [[sun]].<ref name=messierSeds/>

'''M87''' (NGC 4486, Virgo A) is a [[galaxy]] situated in the Virgo cluster, in the [[constellation]] of Virgo and the 87th item in the [[Messier catalogue]].<ref name=messierSeds>[http://www.messier.seds.org/m/m087.html M87] from messier.seds.org, the Students for the Exploration and Development of Space</ref> It is one of the largest galaxies known, containing trillions of [[star]]s<ref name=esa>[http://sci.esa.int/hubble/43215-m87/ M87] from sci.esa.int</ref> It is well known for its jet that extends for thousands of light years from its centre. M87 is an [[elliptical galaxy]], with classification E0 or E1 meaning it is very nearly spherical and is thought to have a mass at least one trillion times that of the [[sun]].<ref name=messierSeds/>

==Environment and Structure==

==Environment and Structure==