42.Quasars, at billions of light-years from Earth the most distant observable objects in the universe, believed to be the cores of galaxies in an early stage of development.

同位语 解释类星体的

earth和the之间没有逗号，会不会引起误解？

我的直观感觉，就是the most distant observable objects in the universe不是

修饰句子主语，而是修饰earth去了。