The Nine Planets

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How many planet are in the inner solar system?

4

How many planets are in the outer solar system?

4

What is Jupiter's Great Red Spot?

A huge storm system

The average distance between the Earth and sun is...

Astronomical unit

Why do they call the inner planets terrestrial?

Because their surfaces are dense rocky

Why are the inner planets called terrestrial planets?

Because, like Earth, they are dense and rocky

In what three ways do the inner planets differ from the outer planets?

Closer, denser, rocky, and small.

What is Saturn's rings made of?

Different sized icy particles

Planets of the inner solar system

Earth, Mercury, Venus, and Mars

What evidence suggest that there was once liquid water on Mars?

Features like dry riverbeds

Where may some of the lost water on Mars be found?

Frozen beneath the Martian soil

A planet that has a deep, massive atmosphere is called a(n)

Gas giant

To which group does earth belong to?

Inner solar system

What is the largest planet in our solar system?

Jupiter

Planets of the outer solar system

Jupiter, Saturn, Uranus, and Neptune

The distance light travels in 1 minute is called a(n)

Light minute

The amount of time an object takes to revolve around the sun?

Period of revolution

The amount of time that an object takes to rotate once

Period of rotation

The amount of time that an object takes to rotate once is called it's?

Period of rotation

Ancient astronomers know that planets were...

Physical bodies

Of the outer planets, why would Pluto NOT be called a gas giant?

Pluto is small, dense, any rocky. Gas giants are big and are mostly made of gases.

A planet with a _________ rotation appears to spin counterclockwise as seen from above it's North Pole.

Prograde

A planet with a _______ rotation appears to spin clockwise as seen from above it North Pole.

Retrograde

The motion of a body orbiting another body in space3

Revolution

What materials does Pluto seem to be composed of?

Rock and ice

Our solar system consists of what?

Sun, planets, and many smaller objects

The inner planets are also called...

Terrestrial

Another way to measure distances in space is by using

The speed of light

How do the inner planets differ from the planets on the outer solar system.

They are spaced closer, dense, and rocky

Why does Mercury's day last almost 59 Earth days?

This is because it rotates slowly and takes longer to rotate

What does the word planet mean?

Wanderers

The time that a planet takes to go around the sun once?

Year


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