Supermassive black holes, containing as much mass as millions or billions of suns, exist at the centre of all galaxies, including our own Milky Way. NASA Goddard Space Flight Center October 1, 2015 Speaking with: Meg Urry on supermassive black holes Tanya Hill, Museums Victoria Research Institute CC BY-ND45.4 MB (download) Tanya Hill speaks with Meg Urry about distant galaxies and the supermassive black holes that lurk in their centres.