exisons

An exison is a theoretical concept in speculative biology and astrobiology, referring to a form of life that has evolved to exist entirely outside of a planetary or celestial body, in the vacuum of space. Such organisms would need to possess adaptations to survive extreme conditions, including a lack of atmosphere, intense radiation, and wide temperature fluctuations. Scientists speculate that exisons might be microscopic, perhaps similar to extremophile bacteria found on Earth, or they could be much larger, with specialized biological structures for propulsion and nutrient acquisition.

The proposed mechanisms for exison survival vary. Some theories suggest they could utilize solar radiation as an energy source, similar to photosynthesis, or derive energy from cosmic rays or interstellar gas. For protection, they might have incredibly resilient cell membranes or exoskeletons capable of withstanding radiation and the vacuum. Movement could be achieved through the expulsion of waste products for thrust, or by harnessing natural forces like solar winds. While exisons remain purely hypothetical, their study contributes to our understanding of the potential diversity of life beyond Earth and the boundaries of biological possibility.