How Do You Detect A Black Hole? Interview with Reinhard Genzel (2008 Shaw Prize & 2020 Nobel Prize)

Nobel laureate Reinhard Genzel describes how decades of infrared tracking of stars orbiting Sagittarius A* pinned down a four-million-solar-mass black hole, including the adaptive-optics tricks that made it possible.

Nobel laureate Reinhard Genzel on how his team detected the black hole at the centre of the Milky Way.

Video by Tom Rocks Maths, played through YouTube's embedded player.