Over the course of human history, perhaps no single object in the night sky has drawn more attention than the Andromeda Galaxy, which the 10th-century Persian astronomer Abd al-Rahman al-Sufi dubbed a ...

Not often do astronomers come across a tear in the tissue of a galaxy a scab so big it might span one-fifth of the Milky Way. But in the spiral galaxy Leo’s NGC 3627, scientists have discovered just ...