For the last 400 years, scientific discoveries have unseated humanity from the centre of the Universe, from Copernicus’ heresy that the Sun was at the centre of the Solar System, to finally culminating in the astonishing consequence of modern cosmology that the Universe actually does not have a centre. Yet we do not detect human-like creatures or technology in other star systems. See whether St Andrews astronomer and astrobiologist Duncan Forgan can explain this.