…which of the symmetries hold at all? The universe is a curious place and cosmologists endeavour to contain this curiosity into one theory. Or maybe two, if they’re unlucky.
On 11th February 2016 the world rejoiced in the astounding news that the Laser Interferometer Gravitational-Wave Observatory (LIGO) had confirmed the first ever direct observation of gravitational waves, predicted a hundred years ago by Albert Einstein in his theory of general relativity. This is hailed as the breakthrough of the century, like the Holy Grail of scientific discoveries.