One hundred years after Einstein predicted them, scientists have finally detected Gravitational Waves – and this has been hailed as the scientific breakthrough of the century. They used the most sensitive scientific instruments ever built to detect them, called ‘twin Advanced LIGO interferometers’. This new field of gravitational-wave astronomy is already revealing remarkable new insights about our universe, confirming that black holes not only exist, but that they can collide and merge together, releasing vast amounts of gravitational-wave energy.