In 1969 American astronaut Neil Armstrong became the first person to walk on the Moon.
It was an amazing achievement, and not just for the obvious reasons.
Today, we're still using things that were developed in the Apollo Moon programme.
Every time you go out running, you could say you're moonwalking.
That's because the cushioned soles in most trainers are made of padded material that was made for space suits!
Do you use a water filter at home? You could be drinking some history.
The filters are based on technology developed to recycle some of the astronauts' bodily fluids - their wee - during the long trip to the Moon and back.
Lots of babies drink milk formula. It's full of something called protein, which helps them grow.
And it's based on the concentrated, rich drinks given to astronauts. They contained lots of protein in a small space making them ideal for cramped space ships.
All our computers use circuits. In 1963, more than half of all computer circuits were being developed for the Moon missions.
That means they drove forward advances in technology which are used in MP3 players, phones or anything which uses computers today.
For the first time, people saw the whole of the Earth. Photos of the globe were popular, and changed the way we thought of our home planet.
Seeing all of it at once made people realise how small and fragile it is, kick-starting the environmental movement.
People began to think of the planet as something that needed to be protected and saved.