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 ...

Comet C/2025 R2 (SWAN) will make a close flyby of Earth on Oct. 21. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A bright new solar system ...

If you’ve not seen the two green comets yet, 90 minutes after sunset on Sunday, Oct. 26, is your last best chance before they fade. The brighter Comet Lemmon (C/2025 A6) and much dimmer Comet SWAN ...