Deep imaging techniques reveal that galaxies are much much bigger than previously thought
Visualization of the gas shroud of starburst galaxy IRAS 08339+6517. Credit: Cristy Roberts ANU/ASTRO 3D If this galaxy is typical, then the study, published today in Nature Astronomy, indicates that our galaxy is already interacting with its closest neighbor, Andromeda. Where does a galaxy end and deep space begin? It seems like a simple question