Invisible Neighbours: Investigating the Hypothetical Co-Existence of Dark Matter Life on Earth

The nature of dark matter remains one of the most profound mysteries in contemporary physics and cosmology. While its gravitational effects are well established, its potential role in supporting alternative forms of life has only recently entered serious theoretical discourse. This paper explores the possibility that dark matter, if composed of self-interacting particles such as dark protons and dark electrons, could form complex structures analogous to atoms, molecules, and ultimately biological systems. Building on the concept of “dark biospheres,” we examine mechanisms that may allow dark life to co-exist with baryonic life on Earth without direct detection, including weak coupling, parallel chemistries, and spatial or energetic segregation. We further analyse potential observational signatures—ranging from anomalous energy dissipation to astrophysical detection limits—that may offer indirect evidence of such hidden life forms. Finally, we discuss the philosophical and Astro biological implications of a shadow biosphere, including its impact on our understanding of habitability, the uniqueness of terrestrial biology, and the scope of life in the Universe. By integrating insights from particle physics, astrobiology, and philosophy of science, this work highlights both the challenges and transformative potential of considering dark matter life as a serious scientific hypothesis.