Notes

All of them are theories about how all the life in the universe started. Let us talk about the first dialogue; The Big Bang. Alexander Friedman & Lemaitre, believe that the world's origin started at a single point singularity and expanded throughout the years/decades. This was supported by the observation of the movement of galaxies seen at night where they noticed that galaxies were moving away from each other. This is the best-supported scientific theory for a long time. Richard Tolman also argued in this theory, therefore if there's a "Big Bang" there's also a "Big Crunch", where the world compressed or back to its original form, and through a million/billion years there's another Big Bang will happen. But, Richard Tolman, Hermann Bondi, and Thomas Gold said otherwise: they're convinced that everything is the same, the universe already existed at the beginning, and no creation is happened. This is called the Steady State Theory. And Last, the Cosmic Inflation- Alan, Andrei Lindi, Paul Steinhardt, and Andy Albrecht are convinced that the universe expanded in a flat way, has a monopole and distant regions were closer to each other.