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Chapter 6: Problem 42

Two Kinds of Planets. The jovian planets differ from the terrestrial planets in a variety of ways. Using phrases or sentences that members of your family would understand, explain why the jovian planets differ from the terrestrial planets in each of the following: composition, size, density, distance from the Sun, and number of satellites.

Short Answer

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Jovian planets differ in composition (gassy vs. rocky), size (larger), density (less dense), distance from the Sun (farther), and number of satellites (more) compared to terrestrial planets.

Step by step solution

01

Composition

Terrestrial planets, like Earth, are made mostly of rock and metal, meaning they have a solid surface. Jovian planets, such as Jupiter, are primarily composed of hydrogen and helium, which make them gassy. This difference occurs because jovian planets formed in a colder part of the solar system where gases were abundant.
02

Size

Jovian planets are significantly larger than terrestrial planets. This is because they have a thick atmosphere of gases and are made from lighter materials, allowing them to accumulate more mass.
03

Density

Terrestrial planets have a higher density because they are made up of heavy elements such as metals and rocks. In contrast, jovian planets have lower densities as they consist mainly of lighter gases like hydrogen and helium.
04

Distance from the Sun

Terrestrial planets are closer to the Sun, located in the inner part of the solar system. On the other hand, jovian planets are situated in the outer solar system, far from the Sun, where it was cold enough for gases to condense.
05

Number of Satellites

Jovian planets have more satellites compared to terrestrial planets. Being larger, they have stronger gravity, which allows them to capture more moons. This generally means they have a lot of smaller moons in addition to possibly a few large ones.

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Key Concepts

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

Terrestrial Planets
Terrestrial planets are fascinating celestial bodies found in the inner solar system. Examples include Mercury, Venus, Earth, and Mars. These planets are characterized by their solid and rocky surfaces. Unlike their gaseous counterparts, terrestrial planets have a significant amount of metals and silicate rocks. This leads to:
  • A compact and dense structure.
  • Moderate sizes compared to the massive jovian planets.
  • An atmosphere, although much thinner than that of the jovian planets.
These planets are much closer to the Sun, which means they experience warmer temperatures. Their proximity to the Sun also influences their overall composition since rocky and metal materials remained solid and stable in the sun鈥檚 warmth, shaping their physical structures.
Jovian Planets
Jovian planets, known as gas giants, inhabit the outer realms of the solar system. These planets include Jupiter, Saturn, Uranus, and Neptune. They stand out due to their enormous sizes, which are much greater than those of terrestrial planets. The key reasons for their size and formation include:
  • Predominantly made up of hydrogen and helium, making them less dense.
  • Thick atmospheric layers that contribute to their massive diameter.
  • Colder regions of the solar system allowed these gases to condense and accumulate.
Their composition is quite different from terrestrial planets due to the ambient conditions where they formed. Hence, their core might be rocky, but the immense layers of gases envelop them and define their appearance.
Planet Composition
The composition of planets in our solar system plays a crucial role in determining their characteristics and potential habitability. Terrestrial planets have a solid crust composed of metals like iron and elements like silicon and oxygen. This makes them:
  • Heavier and denser.
  • Capable of supporting various geological activities such as volcanism and plate tectonics.
On the flip side, jovian planets are largely composed of gases like hydrogen and helium with potential icy and rocky cores. This composition results in:
  • Lower density despite their larger size.
  • Lack of a defined "surface," as the gases gradually compress into liquids under high pressure.
Understanding the composition of these planets helps scientists predict their temperature, weather, and potential to host life.
Solar System Dynamics
Solar system dynamics explain how objects orbit the Sun and interact with one another. The placement and movement of planets affect everything from seasonal changes to tidal effects. Terrestrial planets, being closer to the Sun, have shorter orbital paths and therefore, shorter years. Key points on solar system dynamics include:
  • The gravitational pull from the Sun keeps planets in their particular orbits.
  • Planetary orbits can cause interactions and gravitational tugging, which affects their path slightly.
  • Outer jovian planets have significant gravitational influence, potentially affecting the orbits of satellites and smaller celestial bodies, such as asteroids and comets.
This dynamic system creates a delicate balance that characterizes our solar neighborhood's structure and movement.
Planetary Satellites
Planetary satellites, often referred to as moons, orbit planets and vary greatly between terrestrial and jovian types. Jovian planets host numerous moons, thanks to their massive gravitational pull. They not only have more moons, but these moons can vary greatly in size and composition. Noteworthy aspects include:
  • Jovian planets can have tiny captured asteroids as moons as well as large ones like Ganymede and Titan.
  • Terrestrial planets have fewer moons, like Earth's Moon, mainly due to their smaller mass and weaker gravitational fields.
  • Moons can greatly influence their parent planet's environment, affecting everything from tides to geologic activity.
Understanding these satellites provides insight into the history and evolution of our solar system.

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Most popular questions from this chapter

What is Jupiter's main ingredient? (a) rock and metal (b) hydrogen compounds (c) hydrogen and helium

Rocks from Other Solar Systems. Many "leftovers" from planetary formation were likely ejected from our solar system, and the same has presumably happened in other star systems. Given that fact, should we expect to find meteorites that come from other star systems? How rare or common would you expect them to be? (Be sure to consider the distances between stars.) Suppose that we did find a meteorite identified as a leftover from another stellar system. What could we learn from it?

Dating the Past. The method of radiometric dating that tells us the age of our solar system is also used to determine when many other past events occurred. For example, it is used to determine ages of fossils that tell us when humans first evolved and ages of relics that teach us about the rise of civilization. Research one key aspect of human history in which radiometric dating helps us piece the story together. Write two or three paragraphs on how radiometric dating is used in this case (such as what materials are dated and what radioactive elements are used) and what these studies have concluded. Does your understanding of the method lead you to accept the results? Why or why not?

Planetary orbits in our solar system are (a) very eccentric (stretched-out) ellipses and in the same plane. (b) fairly circular and in the same plane. (c) fairly circular but oriented in every direction.

An Early solar Wind. Suppose the solar wind had cleared away the solar nebula before the seeds of the jovian planets could gravitationally draw in hydrogen and helium gas. How would the planets of the outer solar system be different? Would they still have many moons? Explain your answer in a few sentences.
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