The Andromeda Deep Field . ... ESA , NASA Explanation: What can you learn from looking into the depths of space? In an effort to find out true ages of stars in neighboring Andromeda galaxy 's halo , astronomers stared into the galaxy giant with the new Advanced Camera for Surveys through the Hubble Space Telescope . ... Andromeda's halo stars turned out to be have a wider range of ages than our Milky Way's halo stars, likely indicating more encounters with small neighboring galaxies . ...