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Chapter 12: Problem 21

Explain why Saturn is more oblate than Jupiter, even though Saturn rotates more slowly.

Short Answer

Expert verified
Even though Saturn rotates more slowly than Jupiter, it is more oblate because it is less dense and has a weaker gravitational pull to counter the centrifugal force from rotation. A stronger gravitational force in Jupiter suppresses its oblateness despite its faster rotation.

Step by step solution

01

Understanding the features of the planets

Saturn and Jupiter are the two largest planets in our solar system. Although they are similar in many ways, they also have significant differences. Saturn rotates slower than Jupiter, but is more oblate. Oblateness refers to the degree by which a sphere, like a planet, is flattened at its poles and broadened at its equator.
02

Considering the composition of the planets

Saturn and Jupiter are both gas giants, meaning they are predominantly composed of hydrogen and helium. However, Saturn is less dense overall. It contains more light gases and has less rock and metal in its center than does Jupiter.
03

Analyzing the role of gravitational pull and rotation

The oblateness of a planet is affected by its rotational speed - faster rotation tends to result in more oblateness as the centrifugal force pushes material towards the equator. The gravitational pull is greater in more massive planets, and it acts to make the planet more spherical, hence reducing the oblateness.
04

Concluding the Analysis

Combining these factors provides the answer. Despite Saturn rotating slower than Jupiter, it is more oblate due to its less dense composition. Although Jupiter rotates faster, its greater mass and thus stronger gravitational force act to counteract this and make it more spherical.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Saturn
Saturn is a fascinating planet in our solar system. It is the sixth planet from the sun and is well known for its iconic rings. Saturn is massive and predominantly a gas giant primarily composed of hydrogen and helium. Its density is exceptionally low, even less than water, which influences its shape.

While it rotates slower than Jupiter, it is more oblate, meaning it is flattened at the poles and bulged at the equator. This flattening is due to a combination of its rotational dynamics and its less dense nature. The lower density of Saturn means it has less gravitational pull to counteract the effects of its rotation. As a result, the tendency for the planet to spread out at the equator is more pronounced. This is why, despite rotating slower than Jupiter, Saturn exhibits greater oblateness.
  • Gas giant with less density.
  • Prominent rings and lower density leading to greater oblateness.
  • Flattened poles and expanded equator due to rotational dynamics.
Jupiter
Jupiter is the largest planet in the solar system, with its enormous size and mass greatly influencing its structure and behavior. It spins rapidly on its axis, completing a rotation every 10 hours. This fast rotation tends to increase the oblateness of planets since centrifugal force pushes material toward the equator.

However, in the case of Jupiter, its immense mass means it has a stronger gravitational pull compared to Saturn. This stronger gravity pulls its material towards a more spherical shape, counteracting the effect of the rapid rotation.
  • The largest planet in the solar system.
  • Fastest rotation among the planets, adding to potential oblateness.
  • Strong gravitational pull leads to a more spherical shape.
Gravitational Pull
Gravitational pull is a crucial factor in determining the shape of planets like Saturn and Jupiter. It refers to the force that every mass exerts on every other mass. The greater the mass of a planet, the stronger its gravitational pull, which tends to make the planet more spherical in shape.

In the context of oblateness, gravitational pull works against the centrifugal force created by a planet's rotation. For massive planets like Jupiter, the force is significant enough to keep its equatorial bulge more restrained compared to Saturn's. Despite a faster rotation, Jupiter appears less oblate than Saturn because its extra mass enhances its gravitational pull, mitigating the flattening effects of rotation.
  • The force that keeps planets spherical and counters centrifugal effects.
  • Stronger in more massive planets, hence less oblate.
  • Crucial in understanding planet shapes and dynamics.

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Most popular questions from this chapter

Describe the structure of Saturn's rings. What evidence is there that ring particles do not migrate significantly between ringlets?

Mars passes closer to the Earth than Jupiter does, but with an Earth-based telescope it is easier to see details on Jupiter than on Mars. Why is this?

Both Jupiter and Saturn emit more energy than they receive from the Sun in the form of sunlight. Compare the internal energy sources of the two planets that produce this emission.

Astronomers can detect the presence of hydrogen in stars by looking for the characteristic absorption lines of hydrogen in the star's visible spectrum (Figure \(5-21\) ). They can also detect hydrogen in glowing gas clouds by looking for hydrogen's characteristic emission lines (Figure 5-18). Explain why neither of these techniques helped Earth-based astronomers to detect hydrogen in Jupiter's atmosphere.

The two Voyager spacecraft were launched from Earth along a trajectory that took them directly to Jupiter. The force of Jupiter's gravity then gave the two spacecraft a "kick" that helped push them onward to Saturn. The much larger Cassini spacecraft, by contrast, was first launched on a trajectory that took it past Venus. Search the World Wide Web, especially the Web sites for NASA's Jet Propulsion Laboratory and the European Space Agency, for information about the trajectory that Cassini took through the solar system to reach Saturn. Explain why this trajectory was so different from that of the Voyagers.
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