A pair of once-in-a-lifetime comets are rocketing through our skies right now, and it's a rare treat because they won't be back for hundreds of years. The comets, C/2025 A6 (Lemmon) and C/2025 R2 (SWAN),

It will be a while before you can see it for yourself, however. Halley’s comet was last visible from Earth in 1986, meaning we won’t have a chance to see it again until 2061. The comet is expected to appear in our skies around mid-June that year, Space.com reports, and remain visible into August.

Short-period comets get close to the sun much more often than their long-period kin, and every time they do, they deplete more of their gas and dust. Consequently, they don’t typically emit as much reflective material per orbit, so they don’t get as bright.

Two decently bright comets that share a superficial resemblance are gracing our skies right now, in fact: C/2025 A6 (Lemmon) and C/2025 R2 (SWAN). Lemmon has a period (the time it takes to orbit the sun) of about 1,

Comet C/2025 R2 (SWAN) is a new visitor from our outer solar system. It may be easier to see as it approaches Earth next week.

Skywatchers can catch a rare glimpse of Comet Lemmon this month, and it won't be back until around the year 3175. Here's how and when to spot the sparkly green comet.

A rare green Hallowe’en comet will be visible in the night sky over the next few weeks before it vanishes for 1,300 years.