User blog comment:B1littlehero/Speculation of the Origin of Species/@comment-69.180.120.134-20150114010324

im pretty sure the reasons why the golden age collapsed and why the aliens came here in the fitsy place was probably because the originally came to our solar system because mabye their solar system was dying or/ and they were running out of useful resources similar to the reasons why the aliens invaded in a movie called "battle: Los Angeles"....P.S. pretty cool movie.

in the case of the vex they may have been advanced nano droids of a living species that created them and when their creators died the vex went to uncontrolled virius mode and started conquering planets and stuff.