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  • Recently, the ESA’s Euclid space telescope lifted off from Cape Canaveral in Florida.


  • Euclid is named after the Greek mathematician Euclid of Alexandria, who lived around 300 BC and founded the subject of geometry.
  • As the density of matter and energy is linked to the geometry of the universe, the mission was named in his honour.
  • The Euclid spacecraft is approximately 4.7 m tall and 3.7 m in diameter.
  • It consists of two major components: the service module and the payload module.
  • Its operational orbit will be halo around a point known as the Sun-Earth Lagrange point 2 (L2), at an average distance of 1.5 million km beyond Earth’s orbit.
  • This special location keeps pace with Earth as we orbit the Sun (and also hosts ESA’s Gaia and Webb space telescopes).
  • Nominal mission lifetime is six years, with the possibility of extension.
  • The service module contains the satellite systems: electric power generation and distribution, attitude control, data processing electronics, propulsion, telecommand and telemetry, and thermal control.


  • Euclid is designed to explore the evolution of the dark Universe. It will make a 3D-map of the Universe (with time as the third dimension) by observing billions of galaxies out to 10 billion light-years, across more than a third of the sky.
  • Euclid is an ESA mission to map the geometry of the Universe and better understand the mysterious dark matter and dark energy.
  • The mission will investigate the distance-redshift relationship and the evolution of cosmic structures by measuring shapes and redshifts of galaxies.
  • In this way, Euclid will cover the entire period over which dark energy played a significant role in accelerating the expansion of the Universe.
  • Euclid’s image quality will be at least four times sharper than that achieved by ground-based sky surveys.
  • Euclid will build up a large archive of unique data, unprecedented by volume for a space-based mission, enabling research over all disciplines in astronomy.


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