On February 14, 2017, Jim Edwards spoke with Jack Hitt as part of the ongoing series “Amateur Hour,” in which various tinkerers, zealots, and collectors discuss their obsessions. Edwards is a retired aerospace engineer with a passionate interest in astronomy and space exploration. His home observatory in Redondo Beach, California, is designated U73 by the Minor Planet Center for his collection of asteroid data. Edwards has recently been collecting data on the exoplanet WASP-33b. The conversation that follows has been edited for brevity and meaning.