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The Solar System

In this worksheet, students will answer questions on various aspects of our Solar System.

'The Solar System' worksheet

Key stage:  KS 3

Curriculum topic:   Physics: Space Physics

Curriculum subtopic:   Our Sun as a Star, Other Stars and Galaxies

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

This is a diagram of our Solar System. It is a group of planets that orbit the Sun.

 

 

solar system

 

There are eight planets in the Solar System. It is important to remember them in the correct order of their distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Pluto used to be considered a planet, but scientists have changed their mind in recent years and now consider it to be a dwarf planet, along with Ceres and Eris. The diagram above does not show the planets in scale according to size or real distance between them. The further a planet is from the Sun the longer it takes to orbit it. 

 

Asteroids

 

Between Mars and Jupiter there is an asteroid belt. The diagram above shows what it feels like to be in a moving asteroid belt! It is made of thousands of small lumps of rock. Some asteroids cross the orbit of the Earth and, if a huge asteroid collides with the Earth, it can cause a catastrophe. It is believed that the dinosaurs became extinct when a huge asteroid hit the Earth 65 million years ago!

 

Dinosaur asteroid

 

Comets are also part of the solar system. They are balls of dirty ice. Some planets have their own natural satellites called moons.

 

Planets do not give out light but we can see them because they reflect light from the Sun. They look bright because they are much closer to the Earth than other stars. The only planet known to have living organisms on it is Earth. The other planets are too hot or too cold.

Which is the closest planet to the Sun?

What position does Earth hold regarding distance from the Sun?

1st (closest to Sun)

2nd

3rd

How many planets are there in the Solar System? Write your answer as a number. 

What is Ceres?

a planet

a dwarf planet

a star

What is an asteroid?

a dirty ball of ice

a huge ball of gas

a small lump of rock

How many asteroids are there in the asteroid belt?

hundreds

thousands

millions

What do we call the natural satellites of planets?

Which is the only planet with life on it (that we know of!)?

Earth

Venus

Mars

The four planets further away from the Sun are the outer planets. Which ones are they?

Jupiter, Venus, Mars, Neptune

Saturn, Neptune, Uranus, Earth

Jupiter, Saturn, Uranus, Neptune

List the inner planets in the right order of distance from the Sun.

Mercury, Venus, Earth, Mars

Mercury, Venus, Mars, Earth

Venus, Mercury, Earth, Jupiter

  • Question 1

Which is the closest planet to the Sun?

CORRECT ANSWER
Mercury
EDDIE SAYS
Mercury is the closest planet to the Sun. M must be written as a capital.
  • Question 2

What position does Earth hold regarding distance from the Sun?

CORRECT ANSWER
3rd
EDDIE SAYS
Earth is the 3rd planet away from the Sun.
  • Question 3

How many planets are there in the Solar System? Write your answer as a number. 

CORRECT ANSWER
8
EDDIE SAYS
There are 8 planets in our Solar System. Remember, Pluto is no longer counted as a planet.
  • Question 4

What is Ceres?

CORRECT ANSWER
a dwarf planet
EDDIE SAYS
Ceres, Pluto and Eris are dwarf planets.
  • Question 5

What is an asteroid?

CORRECT ANSWER
a small lump of rock
EDDIE SAYS
Asteroids are small lumps of rock.
  • Question 6

How many asteroids are there in the asteroid belt?

CORRECT ANSWER
thousands
EDDIE SAYS
The asteroid belt is made of thousands of asteroids.
  • Question 7

What do we call the natural satellites of planets?

CORRECT ANSWER
moon
moons
EDDIE SAYS
Natural satellites of planets are called moons.
  • Question 8

Which is the only planet with life on it (that we know of!)?

CORRECT ANSWER
Earth
EDDIE SAYS
Earth is the only planet known to have life on it.
  • Question 9

The four planets further away from the Sun are the outer planets. Which ones are they?

CORRECT ANSWER
Jupiter, Saturn, Uranus, Neptune
EDDIE SAYS
The outer planets are Jupiter, Saturn, Uranus, Neptune.
  • Question 10

List the inner planets in the right order of distance from the Sun.

CORRECT ANSWER
Mercury, Venus, Earth, Mars
EDDIE SAYS
The inner planets in the correct order from the Sun are Mercury, Venus, Earth, Mars.
---- OR ----

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