A cosmic clash, frozen in time. 💥 This mesmerising esawebb image shows the heart of the Bullet Cluster — a colossal collision between two galaxy clusters, 3.8 billion light-years away in the constellation Carina. Galaxy clusters are the Universe’s largest structures held together by gravity. Each one contains hundreds or even thousands of galaxies, along with hot gas, dust, and a mysterious ingredient: dark matter. Using its Near-Infrared Camera, the James Webb Space Telescope peered deep into this cosmic battleground, revealing distant galaxies and the faint glow of intracluster stars — stars that float freely, no longer tied to any one galaxy. At the centre of the scene lies a striking light blue spiral galaxy, flanked by the two merging clusters. By studying the light and shapes of thousands of galaxies, scientists were able to “weigh” both the visible matter and the invisible dark matter in these clusters. Their detailed map of mass distribution shows signs of past mergers an...