astronomers have discovered a third galaxy that does not contain dark matter, challenging conventional wisdom about the mysterious substance believed to hold galaxies together. Published in a new study available in pre-print on arXiv, this discovery of NGC 1052-DF9 adds weight to the strong theory of the “Bullet Dwarf” collision, which suggests that galaxies can … Read more
Astronomers have long argued that dark matter is the invisible scaffolding that holds galaxies together. Without its immense gravitational pull, the galaxies’ rotating necks would force them to fly sideways. But now, scientists have found a series of galaxies that do not seem to have their dark matter completely. The latest in this string, known … Read more
Astronomers have revealed a rare triple-double radio galaxy 7.5 billion light-years from Earth. Known as J022248−060934, this mysterious system sheds new light on the behavior of supermassive black holes. With only six other clusters of its kind previously known, this discovery pushes the boundaries of our understanding of cosmic phenomena and could pave the way … Read more
It is not often that astronomers can see large changes in the brightness of a galaxy within a few years. Most galaxies change in brightness (and other properties) over millions or billions of years. So, when images of the distant 10-billion-light-year galaxy J0218-0036 showed that it dimmed to a twentieth of its previous brightness in … Read more