Carl Sagan remains one of the most influential figures in scientific popularization of the 20th century, having devoted his career to bringing science closer to the general public with exceptional communicative passion. Trained as an astrophysicist, Sagan participated in major space missions, notably the Viking and Voyager programs, but it is above all his ability to transform cosmological knowledge into human wisdom that has left its mark on history. His text Pale Blue Dot, inspired by the iconic photograph of Earth taken by Voyager 1 from 6 billion kilometres away, is probably one of the most profound reflections ever written on the human condition. In this moving text, Sagan contemplates our planet reduced to a pale blue dot in the cosmic vastness and reminds us, with striking poetry, that all our conflicts, all our ambitions, and all our civilizations unfold on this "mote of dust suspended in a sunbeam."