Cassiopeia A: A supernova’s light echoes ✨ Explore the incredible beauty and science behind one of the most famous supernova remnants in the sky—Cassiopeia A (Cas A)—through this carousel. From time-lapse videos to detailed observations, the esawebb reveals the secrets of these spectacular light echoes. Let’s dive in! 1. Time-lapse of light echo evolution: This mesmerising time-lapse shows the incredible expansion of a light echo over just a few weeks—a blink of an eye in cosmic terms! Light echoes form when the flash of a star’s explosion lights up surrounding interstellar dust, creating glowing, ever-expanding patterns. Webb’s precision brings this dynamic cosmic dance to life. 2. Shimmering curtains of interstellar dust: Behold the “thermal light echoes” near Cassiopeia A: glowing gas and dust heated by the shockwaves of an ancient supernova. Webb captured this phenomenon multiple times, essentially creating a 3D scan of the interstellar material. Each glowing ripple tells a sto...