The most visible comet of the fall will make its closest approach to Earth overnight. Comet Lemmon (C/2025 A4) is one of a pair of comets sweeping through the solar system. The other is SWAN (C/2025 R2). Lemmon is the more visible of the two, now just visible to the naked eye and peaking in brightness.

Comet Lemmon will pass Earth by roughly 56 million miles as it continues to sail toward reaching its closest point to the sun on November 8th.

Lemmon was discovered back in January by the Mount Lemmon Survey and has been steadily brightening as it moves through the inner solar system. Once it sweeps past the sun and begins to head back out of the solar system, it's not expected to return again until around the year 3175.

To see the comet, look west-northwest after sunset. You can use the

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