Two greenish-hued comets are swinging through the inner solar system this fall, offering a rare chance to spot them in the coming weeks. The comets, named C/2025 A6 (Lemmon) and C/2025 R2 (SWAN), are ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Comet R2 SWAN passes the ...

Perihelion, the point in a planet’s orbit where it is closest to the Sun, is a fascinating phenomenon that shapes much of our understanding of planetary motion. While Earth’s proximity to the Sun ...

Astrophotographer Brennan Gilmore captured this photo of Comet Lemmon on October 4, 2025 from central Virginia. No two comets are exactly alike. While SWAN’s orbit is very well aligned with the plane ...