The belgium priest Georges Lemaître (1894-1966) was one of the first to consider that the Universe began as a result of the explosion of a hyperdense singularity. The scientific community remained skeptical until two years later, when the american astronomer Edwin Hubble (1889-1953) observed that most galaxies are distancing themselves from ours.
He determined that there is a direct and proportional relationship between the velocity at which two galaxies are moving away from each other and the distance between them. The idea of expansion of the Universe was consolidated after the article “The Velocity-Distance Relation Among Extra-Galatic Nebulae”, published in 1931, from a collaboration between Hubble and the american astronomer Milton Humason.
