Category 1
The astronomical unit is based on the distance between
Earth and the Sun
An ______ is a round depression formed by the impact of a meteorite.
Impact Crater
Millions of small, rocky objects called asteroids orbit the Sun between the orbits of
Mars and Jupiter
The four Galilean Moons include
Io, Europa, Ganymede, Callisto
Uranus and Neptune are both made up of hydrogen, helium, and
Methane
Scientists believe that all of the outer planets have ____________ cores.
Small solid
A spherical object that orbits the Sun and is not the moon of another planet is a
Dwarf Planet
The outer planets are also known as the
Jupiter rotates faster than any other planet in the solar system. This causes its atmosphere to stretch into
Colorful Bands
________ is the eighth planet from the Sun
Neptune
What is a common trait of the inner planets?
Solid outer layer
_________ occurs in the Sun and produces an enormous amount of energy
Nuclear Fusion
The inner planets are also known as the
Terrestrial Planets
The soil on Mars contains ________ which give it a reddish color.
Iron Oxide
Uranus has a unique tilt of rotation that makes the planet move around the Sun like a
Rolling Ball
All of the outer planets have
Ring Systems and Moons
Earth is the only planet with a wide variety of life due to its moderate temperatures and
Liquid Water
Objects also spin, or _________, as they orbit the Sun.
Rotate
The _____________ makes Venus the hottest planet in the solar system.
Greenhouse Effect
How many rings does Saturn have?
7
The distances between the ________ part of the solar system are so great that drawing everything on the same scale makes it impossible to represent the inner planets
Outer
________ are pieces of rock that strike the surface of a moon or planet.
Meteorites
Objects in the solar system orbit, or _________, around the Sun.
Revolve
________ does not have an atmosphere because its gravity is not strong enough to hold gases to its surface.
Mercury
Saturn is the least _______ planet.
Dense