Click on the brown stones for further information about that time period.
The Earth is 4 600 000 000 years old.
This is such a huge number and such a long period of time that it is very difficult to understand.
The problem is due to all those zeros, so let's get rid of them.
4 600 000 000
Imagine that Earth is a person who is 46 years old today.
Let's see what happened on some of Earth's birthdays.
But don't forget, on this scale, a year is really 100 million years; a month would be about 8 million years; a week is approximately 1 900 000 years; a day would be around 275 000 years and an hour is about 11 500 years.
There was once a huge cloud of dust and bits of rock swirling round and round in space.
Gradually the dust and rocks fell towards the centre of the cloud where they collided and fused together. They became so hot that a star (our Sun) formed. The outer fringes of the cloud were not so hot and the planets, including Earth, formed in this part.
Although it was cooler in the outer part of the cloud, it was still several thousand degrees centigrade.
When it cooled down to about 1000°C, a metal core formed in the centre of the Earth.
After that the stony mantle and crust cooled around it.
Earth is one of eight planets that, together with asteroids, comets, meteorites, dust and gas, circle the Sun. They all go together to make our solar system and all were formed at the same time.