而在宇宙当中，最大个物体是星系团（galaxy clusters），是由星系组成的自引力束缚体系。虽然所有物体之间都有相互引力，但星系团不会绕著某样东西旋转。
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list of galaxy clusters 星系团表
Galaxy groups and clusters 星系群
Einstein's Gravity and Galaxy clusters.
爱因斯坦引力理论与星系团。
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We have a link between our local scale of the Earth and galaxy clusters.
我们有着地球上的局部范围和星系团之间的联系。
Galaxy clusters are the largest objects bound by gravity in the universe.
银河系星云是宇宙中通过重力相连的最大的物体。
The astronomers measured the quantity and energy of X-rays emitted by eight distant galaxy clusters.
BBC: NEWS | Science/Nature | Dark energy tops science class
Another group of researchers wants to study galaxy clusters using a phenomenon called gravitational lensing.
ECONOMIST: Cosmology
If those objects are galaxy clusters, the growth-rates of such clusters at different times can then be worked out, and inferences drawn about the history of dark energy.
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