Basics
This region of the solar system lies beyond the asteroid belt and before the Kuiper Belt.
The Outer Solar System
Jupiter and Saturn are classified as this specific type of outer planet.
Gas Giants
The largest Planet in the Solar System and can fit around 1000 Earths inside it
Jupiter
This planet is known for having the brightest and most visible ring system.
Saturn
This planet was discovered using mathematics rather than direct observation.
Neptune
This unit, equal to the average distance from Earth to the Sun, is used to measure planetary distances.
Astronomical Unit (AU)
Uranus and Neptune fall into this category because of their chemical composition.
Ice Giants
This famous storm on Jupiter has existed for centuries.
The Great Red Spot
Saturn is so low in density that it would do this if placed in a large enough body of water.
Float
This dwarf planet’s tilted orbit sometimes brings it closer to the Sun than Neptune in certain instances.
Pluto
Compared to the inner solar system, this describes the overall temperatures of the outer solar system.
Much Colder
Hydrogen and helium are the primary gases found in these planets.
Gas Giants
These four moons of Jupiter were discovered by Galileo Galilei.
Io, Europa, Ganymede, and Callisto (Galilean Moons)
This moon of Saturn is the only moon with a thick atmosphere and lakes of liquid methane.
Titan
This region beyond Neptune is the source of many short-period comets.
Kuiper Belt
These types of planets make up the outer solar system.
Gas Planets (Gas Giants and Ice Giants)
Methane, ammonia, and water are more common in the atmospheres of these planets.
Ice Giants
This moon is the largest in the entire solar system and has its own magnetic field.
Ganymede
This planet rotates on its side, with its axis nearly parallel to its orbital plane.
Uranus
This distant, hypothetical region is believed to be the source of long-period comets.
The Oort Cloud
This feature separates the inner and outer solar systems.
The Asteroid Belt
This term best describes all four outer planets because they lack a solid surface.
Gas Planets
This moon is the most volcanically active object in the solar system.
Io
This theory best explains why Uranus has such an extreme axial tilt.
Giant Impact Theory
This spacecraft became the first to visit Pluto in 2015.
New Horizons