Alan Hale and Comet Hale-Bopp (1995) It was on this date, July 23, 1995, that Comet Hale-Bopp was discovered by Alan Hale and, independently, by Thomas Bopp. Working as a shift supervisor in a construction materials company, Bopp, an amateur astronomer, observed the celestial event in Glendale, Arizona. A professional astronomer, Alan Hale made his […]