IRG 2021 Working Tracks Working tracks are an opportunity for attendees to take part in discussions, and work to create valuable and usable output that can last beyond the symposium itself. There is no charge to participate in a working track, but it will require some advance reading. Registering for one of the working tracks lets us know how many people we expect to participate, which helps in room planning. The working tracks for the 7th Interstellar Symposium are: Dark Skies Ken Roy will lead a discussion of Daniel Deudney’s “Dark Skies.” The track will meet during evening sessions Saturday and Sunday (please plan to attend both) and prepare a response to be presented at the plenary session on Monday. Targeting a Habitable World What threshold of criteria does an exoplanet need to meet in order to be considered for a human settlement? What if the atmosphere is fine, but the gravity is too high? What if the gravity is right, but we have to live in domes? We’ll discuss trade offs during evening sessions Saturday and Sunday (please plan to attend both) and prepare a readout for the plenary session on Monday.