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.
On the ninth day of advent we find out about the maths of black holes.
Behind door #8 we answer all the questions you've ever wanted to ask about the physical reality of black holes!
On the sixth day of advent we find out why gravitational waves are so important in revealing the secrets of the Universe.