The amazing world of satellites
They help us in almost every part of our everyday lives - but do we ever think about what satellites do for us?
From what we watch on TV, how we get around and even how we get the food we eat - satellites are involved.
In the latest episode of Newsround's space week, Joe has been checking out everything you need to know about space's little helpers.
He even has a go at finding out how tricky it is to get them into space - using a catapult and some oranges.