Singularities: An answer to a theory of everything Edwin Hubble (along with others) discovered that the universe is expanding. He absorbed that the majority of galaxies where moving away from us from its spectrum. Its spectrum appeared to be redshifted: when the light wave expands when the source of light moves away, thus moving the wavelength of light towards the red end of the spectrum. We know that if the universe expands, if we reverse time, the universe must have been smaller. And some long ago, the universe would have been the size of a dot. It would have infinite mass and density and would be extremely hot enough pull apart not just atoms nor nucleuses, but elementary particles and quarks of which we don’t know its components. This singularity would live in a single dimension, just a point in ‘space’ (in fact this point is space). We learn that this singularity might lead us a key of the universe. However, this isn’t the only singularity we can find in space or in time.