Oxford Discover 4 Unit 2

The .......................studied the moons of Jupiter.

• astronomer

• space probe

• core

• gravity

Scientists sent a ...................... to Mars.

• matter

• space probe

• core

• gravity

The ........................ of Earth is 1,800 miles below the surface.

• matter

• space probe

• core

• gravity

Without ......................., people on Earth would float into the air.

• matter

• space probe

• core

• gravity

Earth's ....................... around the sun is not a perfect circle.

• matter

• orbit

• core

• gravity

Planets and stars are full of ........................ .

• matter

• orbit

• core

• gravity

There is a big .................... between the sun and Earth.

• matter

• orbit

• core

• distance

The ....................of Venus is similar to the Earth's.

• matter

• orbit

• diameter

• distance

Many plants and animals live on our planet's .........................

• surface

• orbit

• diameter

• distance

You can see the moon's .....................with a telescope.

• craters

• planets

• air

• distance