Paul Sutter received his Ph.D. in Physics from the University of Illinois at Urbana-Champaign in 2011. After spending three years at the Paris Institute of Astrophysics, he is now a visiting scholar at the Ohio State University's Center for Cosmology and Astro-Particle Physics. Sutter is the host of several podcasts and YouTube series, consults for TV and film productions, and frequently makes public appearances discussing physics and astronomy topics and the role science plays in society.
Two galaxies, drawn together by forces that they can't see but they can feel. A mutual gravitational attraction. It's inevitable: Inch by inch, light-year by light-year, as the cosmic clock ticks on through the eons, the galaxies grow closer.
A massive cosmic object can act like a lens, magnifying and warping the images of background bodies. Learn all about this "gravitational lensing" phenomenon in the third episode of "We Don't Planet."