Rogue Moons: Warmth Without a Star ⚡ экспресс
Moons of rogue planets can be heated by tidal friction enough to sustain liquid water. Modeling shows that a hydrogen atmosphere acts as the perfect blanket: collisions of H₂ molecules trap heat, while it neither condenses nor breaks down over time, unlike carbon dioxide. Under certain pressure, oceans can last up to 4.3 billion years. Strong tides create wet-dry cycles, and dissolved ammonia makes the water alkaline — conditions favorable for assembling RNA. Thus, moons without suns could become cradles of life.
Rogue planets, ejected from star systems, may harbor life on their moons. A moon of such a planet can preserve heat and liquid water for billions of years. The whole secret lies in a reliable "blanket" and an internal "stove."
But without a blanket, heat escapes. Carbon dioxide is a poor insulator: it freezes out too easily. A dense hydrogen envelope acts like a down comforter, trapping heat. This allows liquid water to exist for up to 4.3 billion years.
Add a bit of carbon, nitrogen, and ammonia to the atmosphere, and you get an alkaline environment, perfect for the chemistry of life. Even in the pitch darkness of interstellar space, warm worlds can bloom.
🎯 The hydrogen "fur coat" of such a moon can weigh as much as several Earth oceans, yet remain transparent—on the surface, eternal twilight, but warm.