A Day on Each of the PlanetsĪ day is the length of time that it takes a planet to rotate on its axis (360°). This is because the gravitational force a planet exerts upon an object at the planet’s surface is proportional to its mass and to the inverse of the planet’s radius squared. Although Saturn, Uranus, and Neptune are also very massive planets, their gravitational forces are about the same as Earth. The planet with the strongest gravitational attraction at its surface is Jupiter. Uranus, Neptune, Earth, Venus, Mars, and Pluto are orders of magnitude less massive. Jupiter is by far the most massive planet Saturn trails it. Saturn is the least dense planet it would float on water. The outer, gaseous planets are much less dense than the inner, rocky planets. Differences occur when the greenhouse effect warms a planet (like Venus) surrounded by a thick atmosphere. Generally, the farther from the Sun, the cooler the planet. They are mostly huge, mostly gaseous, ringed, and have many moons (again, the exception is Pluto, the dwarf planet, which is small, rocky, and has four moons).
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