Two bright comets will swing by Earth this month. Here’s how to see them

Comet Lemmon shines in an image taken by Zwicky Transient Facility on October 3. Zwicky Transient Facility/Palomar Observatory/California Institute of Technology/Quanzhi Ye

Two newly discovered comets are streaking across the sky in a spectacular display as they make their closest approaches to Earth this month.

Comets are made of ice, frozen gases and rock, and as they travel near stars such as the sun, heat causes them to release gas and dust, which creates their signature tails.

Researchers spotted the comet C/2025 A6 Lemmon January 3, while C/2025 R2 SWAN was only recently detected for the first time on September 10 during its close approach to the sun, according to Qicheng Zhang, a postdoctoral fellow studying small body astronomy at Lowell Observatory in Flagstaff, Arizona.

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