[/caption] From a Harvard Smithsonian Center for Astrophysics press release: Dr. Brian Marsden passed away today at the age of 73 following a prolonged illness. He was a Supervisory Astronomer at the Smithsonian Astrophysical Observatory and Director Emeritus of the Minor Planet Center. “Brian was one of the most influential comet investigators of the twentieth … Continue reading "Astronomer Brian Marsden Has Died"