Abstract
Modern Cosmology really started just 100 years ago, when Edwin Hubble first showed that the Andromeda Nebula was actually another galaxy like our own Milky Way galaxy and then shortly after that the Universe is expanding. Half a century later the discovery of the Cosmic Microwave Background radiation by Penzias and Wilson and its exploitation established the hot Big Bang Theory as our reigning model of the Universe. A quarter of a century later Inflationary cosmology called LCDM was established as our more refined model of cosmology. We now have greatly improving observations, better agreement with predictions and some controversy over whether that model needs modification. We can anticipate continuing progress.
