On September 12, 2025, astronomers spotted a new visitor to our skies: Comet C/2025 R2 (SWAN). This comet takes more than 22,000 years to orbit the sun, making this a true once-in-a-lifetime sighting. Early images show a long, beautiful tail. Closest approach to Earth is expected between October 12 and 19, 2025. It might brighten enough to be seen without binoculars. Join Bob King - aka AstroBob - of Sky and Telescope, and EarthSky's Deborah Byrd, as they explore how Comet SWAN was discovered, w