Core Chemistry examines the key points in the development of astronomy, beginning with Greek astronomer Ptolemy's earth centered paradigm to Nicolas Copernicus' introduction of sun centered solar system, and Isaac Newton's three laws of motion. It then examines the discovery of Neptune, Relativity. Hubble's expanding universe, and the discoveries of quasars, white dwarfs, neutron stars, pulsars and black holes, and finally ends with astronomy's modern frontiers - the great attractor, dark matter and life existing on an extra solar planet.