The European Space Agency (ESA) is Europe’s gateway to space. Its mission is to shape the development of Europe’s space capability and ensure that investment in space continues to deliver benefits to the citizens of Europe and the world.
Find out more about space activities in our 23 Member States, and understand how ESA works together with their national agencies, institutions and organisations.
Exploring our Solar System and unlocking the secrets of the Universe
Go to topicProtecting life and infrastructure on Earth and in orbit
Go to topicUsing space to benefit citizens and meet future challenges on Earth
Go to topicMaking space accessible and developing the technologies for the future
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The Moon has been circling the Earth for over four billion years, but where did it come from?
In this video, Ralf Jaumann, planetary geologist at the German Aerospace Centre, DLR, discusses the four theories that could explain the origin of the Earth-Moon system.
There are four theories about the origin of the Earth-Moon system. The first is that Earth captured a celestial body in its orbit. Another possibility is that a rapidly rotating Earth could have thrown material out to form the Moon around it. A third theory is that Earth and the Moon formed at the same time out of the same material. Today, most scientists believe the Moon is ‘Earth's child’ – a large body collided with Earth, destroying our planet’s mantle and sending material into orbit from which the Moon formed. This ‘big splash’ theory would explain why the Moon’s rocks are similar to those on Earth.
Find out more about the why and how of lunar exploration on ESA’s interactive guide of the Moon: https://lunarexploration.esa.int/#/intro