Gamma - ray observations help astronomers understand the basic physics of these sources by measuring the energy and variability of the highest energy radiation coming from these sources , radiation often comes directly from the central engine 通过对这些辐射源的高能辐射变化及能量的测量,射线的观察有助于天文学家了解这些通常直接来自能量中心的辐射源的基本物理性质。