By knowing the distance, you can correct for that, and figure out how luminous the objects actually are.

通过测定距离，你可以修正它，并计算出物体的实际亮度。

Far from being some dim thing, 3C273 revealed itself to be the most luminous object in the Universe ever seen at that time.

3C273 也并不昏暗，而是当时宇宙中最明亮的物体。