The Jovian Planets:

Jupiter, Saturn, Uranus, Neptune

These planets are quite different from the terrestial planets, Mercury, Venus, Earth, and Mars.

They are big:

Some of them rotate fast:

They are far away:


Jupiter is far away: It is big: What does this mean about its density?

It rotates fast:

Jupiter is cold at its cloud tops: Low temperature at start of solar system would allow We should recall something about the physics of gases.

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Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA