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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.
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!
On this, the third day of advent, we explore some strange consequences of general relativity on our concept of time.