Monday, February 20, 2017, 7:30pm – 9:00pm
Ethan Siegel, Author of Beyond the Galaxy
In the 1920s, Edwin Hubble's observations of stars in distant nebulae not only proved that the grand spirals in the sky were galaxies beyond the Milky Way, but allowed us to determine, for the first time, that the Universe was expanding. However, measuring the rate of this expansion has proved challenging: first for geologists, then for stellar astronomers, then for cosmologists and even today. This talk will examine the history of the expanding Universe and detail, up until the present day, how cutting edge science looks to determine, once and for all, exactly how the Universe has been expanding for the entire history of the cosmos.