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Supermassive black hole spotted wandering through space

Scientists sketch aged star system using over a century of observations

 E-Mail IMAGE: U Mon s primary star, an elderly yellow supergiant, has around twice the Sun s mass but has billowed to 100 times the Sun s size. Scientists know less about the companion, the. view more  Credit: Credit: NASA s Goddard Space Flight Center/Chris Smith (USRA/GESTAR) Astronomers have painted their best picture yet of an RV Tauri variable, a rare type of stellar binary where two stars - one approaching the end of its life - orbit within a sprawling disk of dust. Their 130-year dataset spans the widest range of light yet collected for one of these systems, from radio to X-rays.

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