The authors suggest that the mysterious 'little red dots' in the early Universe are supermassive analogues of the microquasar SS 433, seen nearly edge-on. Supercritical accretion (when matter falls in too fast for radiation to push it back) inflates a disk that screens the central engine—explaining both the X-ray faintness and the Balmer jump. According to the model, a face-on view would reveal a blue dot, and the red dot itself is intrinsically brighter than what we see. This scenario ties together different nuclear flavours and turns LRDs into natural laboratories for witnessing rapid black-hole growth in the primordial Universe.
Like a spotlight: from the side it shines dim red, but head-on it's dazzling white-blue. That's exactly how the mysterious 'little red dots' in the early universe appear—they are giant black holes turned edge-on toward us. The thick disk of scorching gas surrounding them hides the brightest radiation, letting only a soft reddish light and the glow of hydrogen through—as red as a neon sign.
Before, astronomers debated: maybe these are dense clumps of stars or the ultra-bright centers of galaxies. But the spectral fingerprint of their light, stretched by the expansion of space, revealed a familiar signature—the same as a stellar pair in the Milky Way where a black hole devours its neighbor.
🎯 The prototype of the red dots—the SS 433 system in our Galaxy—shoots out plasma jets at a quarter of the speed of light, blowing a bubble hundreds of light-years across.
🎬 In Star Wars, the color of a lightsaber signals your side of the Force; in space, the color of a distant black hole depends on the angle: red when seen edge-on, and blue when staring you straight in the face.