A newly discovered celestial visitor, Comet C/2025 R2 (SWAN), is expected to pass by Earth on October 21, offering stargazers across the globe a rare chance to witness a glowing comet visible even to ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Have you seen the comets yet? Comets Lemmon (C/2025 A6) and ...

Later this month, two green comets are forecast to become visible — possibly to the naked eye — in an extremely rare double-act. The brightness of comets is famously difficult to predict, but these ...

While Comet C/2025 R2 (SWAN) made its closest pass to Earth on October 20, 2025, at a distance of approximately 39.1 million kilometers (0.26 AU), it remains a visible, albeit challenging, target for ...