Tonight I begin taking a four-week course titled Introduction to Astrochemistry from the Amateur Astronomers Association, Inc., taught by Samantha Scibelli, Ph.D. Dr. Scibelli gave a free two-hour presentation about EM (electromagnetic) waves for the AAA on Wednesday May 15. Links to the recordings of the free lectures are available from the aaa.org website, but…

On March 27, 2024, the New York Times published an obituary for Henrietta Leavitt, the discoverer of the period-luminosity relation for Cepheid variable stars. Using this relation, astronomers were able to discover that the universe was much bigger than originally thought. This obituary is part of the Overlooked effort of the New York Times to…