A pair of once-in-a-lifetime comets are rocketing through our skies right now, and it's a rare treat because they won't be back for hundreds of years. The comets, C/2025 A6 (Lemmon) and C/2025 R2 (SWAN), look similar. Both comets have already had their brightest nights on Oct. 20 and Oct. 21. But if you're out…

Photo By CNET

Photo By CNET















