Tracking Earth’s Secret Spy Satellites

Behind the night sky is another sky, one obscured by legal darkness and criss-crossed by satellites we’re not meant to know exist. This is the “other night sky,” as geographer-turned-artist Trevor Paglen calls it, a world of clandestine moons and unacknowledged orbiters. Kept out of official reach by defense and intelligence services, this hidden sky nonetheless can be uncovered—if you have the gear to track and observe it.