Which Stars Can Give Birth to Life? The Answer's in the Color ⚡ экспресс
According to the thermodynamic hypothesis, the first organic molecules acted as light absorbers, converting soft UV-C (205–285 nm) into heat. Hard UV-C (<205 nm) destroys such structures. Scientists compared stellar spectra, assessing suitability for molecular self-assembly based on the ratio of soft to hard radiation. The result: only F, G, and massive K stars are suitable for life to evolve, and intelligent life is possible only around G stars. This refines the habitable zone and suggests new biomarkers. Imagine growing a crystal: too bright a light will dissolve it, while ideal light helps it grow.
Life began with molecules akin to natural sunscreen—based on carbon, they soaked up the mild ultraviolet of the young Sun and turned it into heat. This way of dissipating energy wasn’t just heating: it made molecules self-organize, like chefs kneading structured dough out of a chaos of ingredients. But ultraviolet is a finicky tool. Soft light gently joined atoms; hard light snapped fledgling bonds.
Astronomers compared the rainbow fingerprints of starlight and found that only F, G, and massive K stars hit the ideal balance. But for intelligence to emerge, only G-type will do—that’s our Sun. Red dwarfs, which are the most abundant in the Galaxy, offer merely a smoldering warmth: their planets are likely barren. Now the search for habitable worlds zeroes in on yellow stars, and a telltale sign could be an ocean's unusual darkening in the ultraviolet.
🎯 About 20% of sunlike stars in the Galaxy may host planets with a suitable ultraviolet climate—that’s billions of chances for life.
🎬 Sci-fi writers love to populate planets around red dwarfs (like in Interstellar), but the new model shows: their light isn’t enough to ‘knead the molecular dough’ of life.