8L Beyond the Solar System

Match up the key terms and their definitions

• galaxy

• All the galaxies and everything else that exists

• Solar System

• The planets and other bodies orbiting the Sun

• Universe

• Millions of stars grouped together

• star

• There are 8 in our Solar System

• planets

• The Sun is one of these

Stars are:

• Lumps of hot rock in space

• Huge balls of burning gas, like the Sun

• Balls of burning gas, like the Moon

• Pin-pricks of light in the sky

Label the four outer planets.

d

c

b

a

Saturn

Jupiter

Uranus

Neptune

What is 1 light year?

• The distance travelled by light in one year

• The distance from the Earth to the Sun

• The distance from the Sun to the edge of the Solar System

• A non-leap year

What do we call anything that orbits a planet?

• moon

• satellite

• star

• asteroid

Which of the following is not part of the definition of a planet?

• orbits a star

• has sufficient mass to be round

• is not a satellite of another planet

• gives of light

Put these planets in order of distance from the Sun, starting with the closest:

• Venus

• Earth

• Mars

• Jupiter

• Mercury

What is the name of our galaxy?