ANSWER: Jupiter DOES rotate. More Info: Like all other planets in our solar system, Jupiter rotates on its axis in addition to orbiting around the Sun. Jupiter has the fastest rotation of any planet in the solar system of approximately 10 hours and due to the relatively small tilt of its axis of only 3.13°, does not have the kind of seasonal differences between hemispheres that we are familiar with on Earth. Differential Rotation Scientists refer to Jupiter as a “gas giant,” which means the planet is not a solid mass but is rather predominantly composed of various gases surrounding a small inner rocky core. Differential rotation refers to the way that certain gaseous layers of the planet rotate around its axis at different speeds due to various atmospheric and planetary forces. Due to the inconsistent nature of Jupiter’s actual physical rotation, scientists frequently use the rotation of the planet’s magnetosphere (magnetic field) as an official baseline when necessary. Discovery In the 17th century, Giovanni Cassini first observed the various layers of gases comprising Jupiter’s visible atmosphere and estimated its rotation speed. Later in the 20th century, space probes Pioneer, Voyager, and Galileo flew by the planet and obtained much [...]
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