How does tidal heating work on Europa?

Tidal heating occurs when orbital and rotational energy are dissipated as heat due to internal friction from gravitational forces. For Jupiter's moon Europa, this thermal process is driven by tidal flexing as the moon follows an elliptical orbit influenced by gravitational interactions with other bodies. This internal heat keeps Europa's subsurface water ocean liquid and drives geological activity across its icy surface.

What we know

• Tidal heating happens when orbital and rotational energy is dissipated as heat through internal friction caused by varying tidal forces in an elliptical orbit. [2]
• Europa exhibits a relatively young surface shaped by tidal heating as it orbits close to Jupiter. [3]
• The predominant scientific model suggests that heat from tidal flexing causes Europa's subsurface ocean to remain liquid. [3]
• Sustained tidal heating requires gravitational forces from other bodies to prevent an elliptical orbit from circularizing over time. [2]

Where to go next

• compared withWhat causes Io's extreme volcanic activity?
• how it workedHow do orbital resonances maintain elliptical orbits?
• how we knowWhat evidence supports Europa's subsurface ocean?
• the bigger pictureWhat is tidal dissipation in planetary bodies?
• what followedHow will the JUICE mission study Europa?
• an unexpected connectionHow does tidal heating connect to the search for extraterrestrial life?Tidal heating keeps subterranean water liquid on icy moons like Europa, creating a potentially habitable environment far beyond the Sun's traditional Goldilocks zone.

Sources

• [1]tidal heating (Wikidata Q7800788) · CC0 1.0
• [2]Tidal heating · CC BY-SA 4.0
• [3]Europa (moon) · CC BY-SA 4.0
• [4]Io (moon) · CC BY-SA 4.0
• [5]Ganymede (moon) · CC BY-SA 4.0