Featured image is of gravitational lensing in Hubble Deep Field images. See how there’s copies of galaxies and smudging. These distortions in the image are due to large massive astronomical masses between Earth and the galaxies being imaged. Photo credit: NASA **Apologies to Professor Spergel and listeners for the poor sound quality in part 1 … Continue reading 5/31/16 Show feat. Professor David Spergel on His Research Spanning Astrophysical Scales