Euclid, a European space telescope, just captured 26 million galaxies to reveal the secrets of the dark universe.

This story appears in the May 2018 issue of National Geographic magazine ... a project that aims to map the universe. The survey, which launches in 2020, will employ telescopes in the Northern ...

Five years later, after tracking the movements of these spiraling disks, Hubble and his assistant, Milton Humason, had revealed something even more astounding: The universe is swiftly expanding ...