Einstein predicted the existence of gravitationally-warped rings of light in 1915. Now, a new one has been discovered just a cosmic stone's throw from our own planet.

Einstein rings help scientists study dark matter and cosmic expansion. Euclid will find thousands more lenses to map the Universe’s structure

Euclid blasted off on its six-year mission to explore the dark universe on 1 July 2023. Before the spacecraft could begin its survey, the team of scientists and engineers on Earth had to make sure everything was working properly.