The golden age of cosmology is a term used to describe a period of time that spans from 1992 to the present day. This period marks an era of tremendous progress in the field of observational cosmology, characterized by significant breakthroughs and discoveries that have transformed our understanding of the universe. Prior to the golden age of cosmology, our understanding of the universe was limited to what we could observe through telescopes and other instruments. Theories and models were developed based on limited data and observations, and there was much speculation and debate regarding the true nature of the universe.