On the twelfth day of advent we celebrate Stephen Hawking's contribution to cosmology.
On the eleventh day of advent we explore an unresolved puzzle concerning black holes which greatly intrigued Stephen Hawking.
Now we think we know all about black holes, here is another surprise: they are not completely black after all.
On the sixth day of advent we find out why gravitational waves are so important in revealing the secrets of the Universe.
On the fifth day of advent we learn about the heroic effort that led to the detection of gravitational waves and the excitement of their discovery.
Find out how an exploding Sun led Einstein to discover one of the most successful theories ever!