They're everywhere! Nasa discovers millions of new 'supermassive black holes' - and thousands of new galaxies

They're everywhere! Nasa discovers millions of new 'supermassive black holes' - and thousands of new galaxies | Mail Online: "Nasa has discovered a 'bonanza' of supermassive black holes - as well as some extreme galaxies called 'Hot DOGs', otherwise known as dust-obscured galaxies."