A moon does not need sunlight to keep its interior warm. Io is ablaze with volcanoes, Europa hides an ocean, and Enceladus leaks heat and water from its south pole into space — worlds kept active by the gravitational grip of planets that never lets go.

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A moon does not need sunlight to keep its interior warm. Io is ablaze with volcanoes, Europa hides an ocean, and Enceladus leaks heat and water from its south pole into space — worlds kept active by the gravitational grip of planets that never lets go.
Image credit: Spacedaily
Source: Spacedaily

A moon does not need sunlight to keep its interior warm. Io is ablaze with volcanoes, Europa hides an ocean, and Enceladus leaks heat and water from its south pole into space — worlds kept active by the gravitational grip of planets that never lets go.

Tidal heating turns orbital motion into internal energy. The same mechanism drives Io's lava, helps preserve Europa's ocean and powers Enceladus's south-polar vents. The post A moon does not need sunlight to keep its interior warm.

Key Points

  • Tidal heating turns orbital motion into internal energy.
  • The same mechanism drives Io's lava, helps preserve Europa's ocean and powers Enceladus's south-polar vents.
  • The post A moon does not need sunlight to keep its interior warm.

Published: August 20, 2026 9:30 pm

Source: Spacedaily

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