Jared told me what he had found out regarding cell phone frequencies - we then discussed how radio telescope facilities need to be 'cell-phone-quiet' zones due to interference between cell phone frequencies and telescope operating frequencies, otherwise the observations are messed up. We then covered the major highlights in astronomy from Copernicus' heliocentric model in the mid-1500s up to Edwin Hubble's groundbreaking discovery that all galaxies appear to be receding from us based on the redshift signature in their spectra .. This eventually led to the concept of an expanding Universe.