We can say more accurately that humans appeared on Earth two million years ago.

Approximately how old is the universe?

The Earth weighs an astonishing six billion trillion tonnes.

Scientists disagree about exactly when the big bang which created the universe happened.

The Earth rotates most quickly at the equator.

The universe has been expanding rapidly ever since the Big Bang.

The distance from the surface of the Earth to the centre is as far as from New York to Moscow.

Which is further? From New York to Moscow or from the surface to the centre of the earth.

Which city is the furthest from where you live? Manchester, London or Brighton?

Animals and plants are largely made up of water.

We can measure distances in space in light years.

The first moonwalk was from Apollo 11 on 21 July 1969.

Organisms began to breathe oxygen 400,000,000 years ago.

Organisms began to breathe oxygen 400,000,000 years ago.

The universe has been expanding rapidly ever since the big bang.

The Earth rotates most quickly at the equator.

The astronauts left their spacecraft, Apollo 12, for a walk on the surface of the moon.

The first two spacewalks took place in 1965.

The Earth weighs an astonishing six billion trillion tonnes.

Scientists disagree about exactly when the big bang which created the universe happened.