The permanent and stable magnetic field detected on Ganymede by the Galileo spacecraft indicates that this moon must have a source of internal heat to provide for the movement of electrically charged material.What is thought to be the source of the heat?
A) decay of radioactive materials
B) release of gravitational potential energy at the moon's original formation
C) tidal flexure caused when this moon moved in an elliptical orbit earlier in its history
D) tidal flexure at the present time from neighboring moons and Jupiter

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The Answer of The permanent and stable magnetic field detected on Ganymede by the Galileo spacecraft indicates that this moon must have a source of internal heat to provide for the movement of electrically charged material.What is thought to be the source of the heat?
A) decay of radioactive materials
B) release of gravitational potential energy at the moon's original formation
C) tidal flexure caused when this moon moved in an elliptical orbit earlier in its history
D) tidal flexure at the present time from neighboring moons and Jupiter

The Permanent and Stable Magnetic Field Detected on Ganymede by the Galileo