FLAGSTAFF, Ariz. – This month, two bright comets, Swan and Lemon, are set to pass by Earth.

Researchers at the Lowell Observatory in Flagstaff, Arizona, have provided information about their limited visibility.

Swan can be observed in the early evenings, shortly after the sky darkens.

Lemon is visible right before sunrise but will soon only be visible in the evening.

These comets offer a unique opportunity for observation, as they are not expected to return anytime soon.

Swan will not reappear for another 650 to 700 years, while Lemon won't be seen again for another 1300 years.

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