If you’ve not seen the two green comets yet, 90 minutes after sunset on Sunday, Oct. 26, is your last best chance before they fade. The brighter Comet Lemmon (C/2025 A6) and much dimmer Comet SWAN (C/2025 R2) are now barreling away from Earth, reducing in brightness as they do, while a 24%-lit waxing crescent moon is on the cusp of making comet-observing significantly more difficult. With Lemmon in the northwestern sky and SWAN below the Summer Triangle stars in the south, near Saturn, it’s time to grab a pair of binoculars and take a look — or wait for 1,150 years.
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