Roger O’Brien’s talk on “Cosmology“ was a conversational journey from the Steady State Theory to the Big Bang Theory, with reference to the discovery of the Cosmic Background Radiation, and a practical demonstration of the kinds of measurements needed to demonstrate that the Universe is expanding. Along the way he stressed the importance of testing scientific theories by using them to make predictions and then comparing observed results with those tredictions. The Cosmic Background was a good example. Both the Big Bang and Steady State theories could explain it, but the nature of the actual observations are much closer to the Big Bang theory’s predictions than the Steady State theory’s ones.
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