The Virgo Cluster of Galaxies is the closest cluster of galaxies to our Milky Way Galaxy. The Virgo Cluster is so close that it spans more than 5 degrees on the sky – about 10 times the angle made by a full Moon. With its heart lying about 70 million light years distant, the Virgo Cluster is the nearest cluster of galaxies, contains over 2,000 galaxies, and has a noticeable gravitational pull on the galaxies of the Local Group of Galaxies surrounding our Milky Way Galaxy. The cluster contains not only galaxies filled with stars but also gas so hot it glows in X-rays. Motions of galaxies in and around clusters indicate that they contain more dark matter than any visible matter we can see. Pictured here, the heart of the Virgo Cluster includes bright Messier galaxies such as Markarian’s Eyes on the upper left, M86 just to the upper right of center, M84 on the far right, as well as spiral galaxy NGC 4388 at the bottom right.

?室女星系團(tuán)是離我們銀河系最近的星系團(tuán)。而室女星系團(tuán)是如此的密近，以致于它在天空綿延了超過5度（約為滿月的10倍）的天區(qū)。中心離我們約7千萬光年遠(yuǎn)的室女星系團(tuán)，除了是最鄰近我們的星系團(tuán)之外，其內(nèi)更擁有超過2,000個(gè)成員星系，并對包括銀河系在內(nèi)的本星系群成員有顯著的重力牽引。室女星系團(tuán)之內(nèi)，除了有擠滿恒星的星系之外，也有溫度高到會發(fā)出X射線輻射的氣體。星系團(tuán)里和周圍的星系之運(yùn)動(dòng)顯示，此星系團(tuán)所含的暗物質(zhì)總量多于可見物質(zhì)。上圖所呈現(xiàn)的室女星系團(tuán)核心區(qū)，擁有許多明亮的梅西葉星系，諸如左上角的馬卡萊恩之眼、中右上方的M86、右緣的M84、以及右下方的螺旋星系NGC 4388。