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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This image of ESA astronaut Alexander Gerst was shared on his social media channels on 10 September 2018.
Alexander said "How do you weigh yourself in weightlessness? The answer is shaking. When we bounce ourselves at the end of a spring loaded rod, the time it takes for one bounce tells us our exact body mass."
Follow Alexander and the Horizons mission on social media on his website and on his blog.