Kalamazoo Astronomical Society General Meeting Looking Up Since 1936 PUBLIC SERVICE ANNOUNCEMENT Location: Due to the Pandemic, the location is uncertain and may be held online. Please visit http://kasonline.org/ for more information. Date: Friday, May 7, 2021 @ 7:00 – 9:15 p.m. From: Joe Comiskey / email@example.com 269-532-6965 (Please do not publish) _________________________________________ When Worlds Collide - Galaxy Collisions and Their Aftermath presented by Dr. Eric F. Bell Over the last 25 years, it has become clearer and clearer that galaxies collide and merge frequently - the Milky Way could have had tens to hundreds of such collisions over its life, and is experiencing two largish ones right now. The most important of these events are the largest ones, and it is unclear what those collisions and subsequent mergers do to galaxies. The outskirts of galaxies contain critical clues about these largest collisions - the debris from these is spread over huge areas, and is particularly prominent in the distant outskirts of galaxies. We have been working for about a decade to develop a method to measure these outskirts (by imaging individual stars in other galaxies), and use sophisticated computer simulations to use these measurements to measure the largest collision and merger that a galaxy that has had. We use this to determine the collision and merger history of the Andromeda galaxy (M31), and learn about how it shaped Andromeda's disk, bulge and satellite system, including the enigmatic M32 satellite galaxy. We can then use this intuition to discuss what will happen when the Milky Way and Andromeda, in many billions of years, will collide and merge into a single galaxy. About the Speaker: Eric Bell is the Arthur F. Thurnau Professor of Astronomy at the University of Michigan. He obtained a Bachelors degree in Physics and Astronomy from the University of Glasgow, Scotland and PhD in Physics from Durham University, England. Dr. Bell studies the physics of galaxy formation and evolution using large survey datasets. His areas of particular interest include the evolution of non star-forming galaxies over the last 10 billion years, the exploration of galaxy interactions and their effects on galaxies, and the use of stellar population models in analyzing the evolution of the galaxy population. _________________________________________________________________________ For more information please visit our website: www.kasonline.org You can also follow the KAS on Twitter and/or Facebook. Admission is FREE!