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The Composition and Structure of the Outer Solar System

Explore the composition and structure of the outer Solar System, home to gas giants like Jupiter and Saturn, and ice giants Uranus and Neptune. This region also includes smaller bodies such as centaurs and comets, with celestial features like rings, moons, and cryovolcanism. Learn about the unique characteristics of these distant planets and their satellites, as well as the dynamic environment beyond the main asteroid belt.

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1

The region beyond the ______ ______ is known for housing the gas giants ______ and ______, as well as the ice giants ______ and ______.

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main asteroid belt Jupiter Saturn Uranus Neptune

2

Jupiter's mass compared to other planets

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Jupiter has over twice the mass of all other planets in the Solar System combined.

3

Significance of Jupiter's Great Red Spot

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The Great Red Spot is a persistent high-pressure region in the atmosphere of Jupiter, producing an anticyclonic storm.

4

Unique attributes of Saturn's largest moon, Titan

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Titan has a thick atmosphere and is the only moon known to have stable bodies of surface liquid, with lakes of hydrocarbons.

5

______ stands out among planets due to its significant axial tilt, leading to atypical seasonal shifts.

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Uranus

6

The planet with the chilliest atmosphere in the Solar System is ______, which also possesses a subtle ring system.

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Uranus

7

______ is recognized for having 27 moons and an extreme axial tilt affecting its seasons.

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Uranus

8

Despite being less voluminous than ______, Neptune is denser and emits more internal heat.

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Uranus

9

Neptune's largest moon, ______, is unique for its cryovolcanic activity.

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Triton

10

The moon with a backward orbit around Neptune, ______, likely originated from the Kuiper belt.

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Triton

11

Both Uranus and Neptune have intricate ______ and are orbited by small bodies at stable Lagrange points.

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magnetospheres

12

The celestial bodies that co-orbit with Uranus and Neptune at stable points are known as ______.

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trojans

13

First discovered centaur & its behavior

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2060 Chiron, exhibits cometary activity like outgassing.

14

Largest centaur & unique feature

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10199 Chariklo, distinguished by its ring system.

15

Comet composition & appearance near Sun

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Comets made of ice, dust; develop coma, tail close to Sun.

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The Composition and Structure of the Outer Solar System

The outer Solar System extends beyond the main asteroid belt and is home to the gas giants Jupiter and Saturn, as well as the ice giants Uranus and Neptune. This region is also populated by smaller celestial bodies such as centaurs, trans-Neptunian objects, and comets. The low temperatures in this part of the Solar System allow volatile compounds like water, ammonia, and methane to exist in solid form. The four giant planets hold the majority of the mass in this region, with Jupiter and Saturn being predominantly composed of hydrogen and helium, and Uranus and Neptune containing more ices within their makeup.
Montage of the gas giants Jupiter with the Great Red Spot, Saturn and its rings, blue Uranus and Neptune, on a starry background with centaurs and comets.

The Gas Giants: Jupiter and Saturn

Jupiter is the largest planet in our Solar System, with a mass over twice that of all the other planets combined. Its atmosphere is characterized by complex cloud formations and the iconic Great Red Spot, a massive storm. Jupiter's extensive magnetosphere, the largest of any planet, reaches far into space. It has a retinue of 79 known moons, including the four large Galilean moons: Ganymede, Callisto, Io, and Europa, each with its own unique geologic characteristics. Saturn is known for its stunning rings and has a similar composition to Jupiter, though it is less massive. Saturn's lower density means it would float if placed in a large enough body of water. It has 82 confirmed moons, with Titan being the largest and exhibiting a thick atmosphere and liquid hydrocarbon lakes, and Enceladus showing evidence of subsurface oceans.

The Ice Giants: Uranus and Neptune

Uranus is unique among the planets due to its extreme axial tilt, which causes unusual seasonal changes. It has the coldest planetary atmosphere in the Solar System and a faint ring system, along with 27 known moons. Neptune, though smaller in volume than Uranus, is more massive and has a warmer interior that radiates more heat. It has 14 known moons, with Triton being the largest and exhibiting cryovolcanism. Triton's retrograde orbit suggests it was captured from the Kuiper belt. Both ice giants have complex magnetospheres and are accompanied by small objects known as trojans, which share their orbits at stable Lagrange points.

Centaurs and Comets: Small Bodies of the Outer Solar System

Centaurs are icy asteroid-like objects with unstable orbits between Jupiter and Neptune. They are believed to originate from the Kuiper belt or scattered disk and can evolve into comets or be ejected from the Solar System. The first centaur discovered, 2060 Chiron, shows cometary behavior such as outgassing. The largest centaur, 10199 Chariklo, is notable for having a ring system. Comets are composed of ice and dust and develop a coma and tail when their orbits bring them close to the Sun. Short-period comets are thought to come from the Kuiper belt, while long-period comets are believed to originate from the distant Oort cloud. Some comets on hyperbolic trajectories may come from interstellar space. Over time, as comets lose their volatile materials, they may become more asteroid-like in appearance.