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1·The Coma cluster of galaxies pictured above is one of the densest clusters known - it contains thousands of galaxies.

这张照片中的后发星系团是已知最密集的星系团之一——包含了数千个星系。

2·Possibly because the galaxy, NGC 4911, is being pulled at by its neighbors as it falls into the enormous Coma Cluster of Galaxies.

可能是因为这个星系（NGC 4911）正被拉扯进巨大的后发座星系团之中。

3·Remarkably, the ion tail easily stretches past background star cluster NGC 1245 (upper left) in the constellation Perseus, about 1.5 degrees from the comet's lovely greenish head or coma.

明显地，离子彗尾轻易伸展至背景星团NGC 1245（上左）的前面，在飞马座，离彗星可爱的绿色彗头或彗发1.5度。

4·Sliding your cursor over the picture will identify the planets, the stars of Leo, and a long-recognized star cluster in Coma Berenices.

对照图标出了狮子座的恒星，行星火星和土星，和早为人知的后发座星团。

5·While studying the Coma galaxy cluster, he found that the galaxies' gravity alone was much too small to hold the cluster together.

他在研究彗差星系簇的时候，发现星系本身的引力作用太小而不足以维持星系簇的成型。