At these extreme high densities, the core actually resists collapse, and as a result, all of this infalling material bounces off the core.

在这些极高的密度下， 核心实际上抵抗坍缩，结果，所有这些下落的物质都从核心反弹。

Sometimes you don't even need an orbiting star at all, and just the x-rays and radio waves from the hot infalling material can be used to determine the mass of a solitary non-star object.

有时候，我们甚至根本不需要轨道上的恒星，仅需要x射线以及来自热陨落物质的电波就可以确定一个孤立的非恒星物体的质量。