The mathematics behind general relativity
The Singularity Theorem (Nobel Prize in Physics 2020)
In 2020, Roger Penrose was awarded half of the Nobel prize in physics for proving that black hole formation is a robust prediction of Einstein’s general theory of relativity.
From soap bubbles to Einstein
Most readers will know them from childhood: soap bubbles
The many ways of building an empty, unchanging universe
More information on one particular answer to the question of how much variety is permitted in general relativity – how many ways are there of constructing a universe that is completely empty of all matter?