Spinning Black Holes and MCG 6 30 15 . ... Credit Copyright: XMM-Newton , ESA , NASA Explanation: What makes the core of galaxy MCG-6-30-15 so bright? Some astronomers believe the answer is a massive spinning black hole . ... A spinning black hole could explain both effects. A strong magnetic field could be the mediator transferring rotational energy from the black hole to the surrounding gas. Pictured above is an artist's illustration of a black hole surrounded by an accretion disk . ...