Saturday, March 26, 2016
''The monster at the heart of our galaxy'' Professor Andrea Ghez
''Learn about new developments in the study of black holes. Through the capture and analysis of twenty years of high-resolution imaging, Dr Ghez and her team have moved the case for a supermassive black hole at the centre of our galaxy from a possibility to a certainty. Further advances in state-of-the-art high-resolution imaging technology on the world’s largest telescopes have greatly expanded the power of using stellar orbits to characterise black holes. Recent observations have revealed an environment around the black hole that is quite unexpected (young stars where there should be none; a lack of old stars where there should be many and a puzzling new class of objects). But continued measurements of the motions of stars have solved many of the puzzles posed by these perplexing populations of stars. This work on the orbits of stars..''