How do we know there's a black hole in every galaxy centre? | History of Supermassive Black Holes
17:16
The 5 types of BLACK HOLES
16:10
The Final Parsec Problem: do SUPERMASSIVE black holes ever MERGE?
16:38
How do we know the Milky Way is a spiral? | The History of the Milky Way
19:54
Was Einstein "wrong"? | Testing new theories of gravity
56:02
The history of black holes - with Marcus Chown
33:08
Why is it so hard to return to the moon?
22:43
Spinning a black hole as fast as possible
17:02