Teleios: The Perfect Bubble—Unraveling the Mystery of a Supernova Sphere
In early 2025, astronomers using the Australian Square Kilometre Array Pathfinder (ASKAP) discovered Teleios—a remarkably symmetrical, spherical structure in the Milky Way that defies conventional expectations. Unlike typical chaotic supernova remnants, Teleios appears as a near-perfect circle in radio wavelengths yet remains invisible in optical light. Its distance is debated, estimated between 7,175 and 25,114…