Resumen de There at the birth
Peebles recalls that the big bang and steady state theories both have their origin in the discovery in the 1920s that distant galaxies are moving away from humans, as if the universe were expanding. The big bang theory, developed in the ensuing decades, postulates that everything here now was also there back then, so the universe must be expanding from a denser early state. The steady state theory suggests instead that matter is continually created in the expanding universe, with new galaxies forming to fill the spaces that open up as already existing ones move apart. In this picture, the universe's past was no hotter or denser than its present.
