Every galaxy you've ever seen in a photograph is hiding something. Beyond the glowing disc of stars and gas that the camera captures lies a vast, ghostly outer region called a halo, too faint to see easily but packed with clues about how that galaxy came to be. ESA has just formally committed to a m...
Reading the Galaxy's Past
By system
June 12, 2026 •
300 views
Original source:
Universe Today
