Cosmicism
The philosophy of cosmicism states "that there is no recognizable divine presence , such as a god , in the universe , and that humans are particularly insignificant in the larger scheme of intergalactic existence . " The most prominent theme is humanity's fear of their insignificance in the face of an incomprehensibly large universe: a fear of the cosmic void . 
<triplet> intergalactic <subj> universe <obj> part of