Life Without a Sun? Scientists Say It May Thrive on Rogue Planet Moons

Moons orbiting free-floating planets can keep their oceans liquid for up to 4.3 billion years.

These moons drift through interstellar space without a host star.

Strong tidal forces repeatedly flex a moon’s interior, generating heat (tidal heating).

Dense hydrogen atmospheres could sustain habitable conditions for long periods; collision-induced absorption lets hydrogen absorb infrared radiation at high pressure.

Liquid water is a key ingredient for life.