反物质

Beyond galactic centre, the cloud is not entirely spherical.

银河中心之外， 反物质云不是完整的球形。

The opposite would be anti - existence, as the opposite of matter is antimatter.

存在的对立面应该是 反 存在， 正如物质的对立面是反物质一样。

Antimatter has been produced experimentally, but little of it is found in nature.

反物质已在实验室中产生， 但还未在自然界中找到。

I told him I couldn´t think of any reason why antimatter wasn´t a plausible explanation.

我告诉他，我也觉得反物质算是个说得过去的解释。

Fewer than zero particles being present usually means that you have antiparticles instead.

少于零也就是说只存在反物质。