The last song in Pink Floyd’s LP The Dark Side of the Moon, published in 1973, mentioned it: «There’s no dark side of the Moon really. Matter of fact, it’s all dark. »

Question submitted by FRANCESC AGUILAR I DOMENJÓ (Grau de Castelló). MANEL PERUCHO answers: The latest Background Microwave Radiation observations and type Ia cosmological supernovae indicate that the Universe has a flat geometry and its expansion is accelerating. This fact, which seems unrelated to the question, is

Foto: Arthur CaravanFragment of the cover of Atles enharmònic (self-produced, 2011), Arthur Caravan's album that includes a song inspired by Pythagoras. Music has accompanied humanity throughout history, however, it is not exclusive to humans. We know it exists in the animal

You probably remember Steven Spielberg's 1977 film Close Encounters of the Third Kind in which, in a memorable final scene, humans communicate with aliens with music, specially with that well known "D E C C G" melody that would be later hummed by everyone.