Using gravitational lensing (where massive objects bend light like a lens), astronomers studied a newly found object weighing a million Suns. Modeling showed it consists of a compact core with radius under 10 parsecs, nested in a larger, nearly constant-density cloud extending to 139 parsecs—a configuration matching no known celestial body. If dominated by dark matter, this structure contradicts cold dark matter predictions but aligns with self-interacting dark matter, where the central region could have collapsed into a black hole. This finding might reshape our understanding of the universe's hidden mass.
Supermassive bodies warp space, turning into a lens that bends light from distant objects. Such spacetime curvature allows astronomers to see the invisible. Recently, this method helped detect a hidden clump with the mass of a million Suns.
Analysis of light distortions revealed the strange structure of the find. A tiny dense core—most likely a black hole —is surrounded by a vast cloud stretching hundreds of light-years with nearly constant density. In the standard model of dark matter, density should increase towards the center, like thickening jelly. Here it's the opposite, like a lens with a blurred focus. This structure aligns with the self-interacting dark matter hypothesis: its particles can collide and stick together, preventing a dense core from forming.
🎯 Einstein predicted gravitational lenses back in 1912, but thought the effect would be unnoticeable. Today, it's our main tool for 'weighing' the invisible.