设计了一个简单的思想实验，用动量定理对洛伦兹变换成立的条件导出了相对论质量公式。

Based on the theorem of momentum, the mass equation of special relativity is derived using a simple thought experiment.

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例如，基于广义相对论，科学家们认为暗物质的存在是因为宇宙物体的运转表明似乎它们有比我们能观测到更大的质量。

Based on general relativity, for example, scientists think dark matter exists because some cosmic objects behave as if they have more mass than we can see.

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广义相对论预言这种光的波长会因这些星系的质量而有少量的偏移，这种效应称为引力红移。

General relativity predicts that the wavelength of this light will be shifted by a small amount due to the galaxies' mass, in an effect called gravitational redshift.

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It turns out, it's part of a big picture and all of general relativity is based on this one great equivalence of two quantities which are very different attributes.

已经证明的是,这确实只是冰山一角,广义相对论的所有理论,都是建立在这两个质量相等的基础之上,而这两个质量的属性有很大差异

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