The existential threat of death and our finite mortality is an integral driver of human behaviour. This fear of death and the protective mechanisms utilised to allay our fear of death, have been examined extensively by terror management theory and mortality salience research. Until now, however, very little attention has been paid to existential threats other than death. The present study proposed that the vastness of the universe is one such contemplation capable of eliciting existential threat and challenging the meaning, purpose, and value of our lives. A sample of 327 American citizens were recruited via Amazon’s Mechanical Turk and assigned to one of three experimental conditions. One of which formed the cosmic perception induction, which elicited considerations of the vastness of the universe. The results of inducing considerations of space was shown to negatively affect the selfesteem, just world belief, existential wellbeing, and religious zeal of Christian participants and not non-religious participants. The implications of this finding are discussed, particularly with regard to the divergence from terror management theory.