Euclid satellite is the next cosmology mission of ESA (European Space Agency), to be launched in 2024. Euclid aims at solving the mystery on dark energy, i.e. what is causing the acceleration of the expansion of the universe. Possible explanations include dark energy, or a modification of the laws of general relativity at large distance scales. Euclid satellite will carry two instruments, one operating at visible wavelengths, and one in the infrared range. Together the two instruments will observe billions of galaxies, measure the expansion history of the universe, and map the distribution of matter in our universe through galaxy lensing. The Euclid research group at University of Helsnki is developing data analysis methods for Euclid. University of Oulu uses Euclid data to study the evolution of galaxies.

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