Two rare bright comets are visiting our neighbourhood this month, making for once-in-a-lifetime viewing.

The comets, C/2025 A6 (Lemmon) and C/2025 R2 (SWAN), are already showing off their green tails to cameras and telescopes. But the best chances to see them with the naked eye from the northern hemisphere should be in the second half of the month.

“What stands out about these two is their potential brightness,” said Erika Gibb, an astrobiologist at the University of Missouri-St. Louis. “For sky-gazers, it is relatively uncommon for comets to be observable, and they really are beautiful objects.”

It helps that both comets are expected to be closest to Earth around the time of the Oct. 21 new moon, which should help them stand out in the night sky.

Comet Lemmon should be most visible be

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