主题：【原创】漫谈暗物质 -- afar77

可惜第二张没拍好。

当时在美国航空航天博物馆拍的。后面是一个小的光源，模拟一个星系的恒星，然后分别透过两个不同质地的塑料透镜观看它们的实际成象。

大约是最浅显的“如何证明有暗物质存在”的原理图

下面的图上的解释字样是这样的：

What happens and why?

The varying thickness of one plastic lense bends light and distort your view of galaxy. In a real universe, a powerful field of gravity acts in a similar way. Bending light, and creating a sort of "gravitational lens" that distorts our view of galaxy behind it.

It takes a huge concentration of mass such as a cluster of galaxies to produce a noticable gravitational lens. Sometimes the distortions is so great that only an additional amount of unseen mass can account for it. Such material, which can only be detected by the effect of its gravity, is what we call "dark matter".

还是那句话，astro physics is not easy...cos you guys are not getting any in situ measurements...