The Euclid mission aims to uncover the mysteries of the 'dark' Universe. This ominous-sounding invisible part of the cosmos makes up more than 95% of the mass and energy in our Universe.

Ordinary matter that makes up everything we see – from stars and galaxies to planets and people – amounts to only 5% of the cosmos
Dark matter makes up ~25% of the cosmos
Dark energy makes up ~70% of the cosmos

THE LIGHT AND DARK UNIVERSE