Dive into NASA's ATLAS system as interstellar 3I/ATLAS nears Sun on 29 Oct 2025—no Earth hit, but astrometry campaign probes ...

Answer: It’s a comet that comes from another stellar system, from another star. It’s the third one we’ve ever discovered. The first, 1I/ʻOumuamua, resembled an asteroid more than a comet, but the ...

Comet C/2025 A6 (Lemmon), captured from the Dark Sky Alqueva Observatory in Portugal on October 2, 2025, glows green as it nears its closest approach to Earth. Here’s how to see this rare green comet ...

It was early January 2025 when a faint light spot was observed at the Mt. Lemmon Observatory in Arizona. Follow-up observations revealed that the object was a comet visiting from the outer edge of the ...

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 ...

A newly discovered comet is about to make its closest pass to Earth on Tuesday night. It should be visible over the Central Coast before it disappears — and won’t be seen again for more than a ...

A comet discovered earlier this year, now just bright enough to be visible to the naked eye, is poised to be among the top celestial events of 2025. Known as C/2025 A6 (Lemmon), this celestial ...

Analyses of its emissions using NASA’s Neil Gehrels Swift Observatory indicate that the interstellar comet probably has a very different structure than comets in the solar system. Hydroxyl compounds ...

No two comets are exactly alike. Of course, they can appear similar. Two decently bright comets that share a superficial resemblance are gracing our skies right now, in fact: C/2025 A6 (Lemmon) and ...

An interstellar comet is dramatically jetting off ice and dust into space, a new image shows. The comet, called 3I/ATLAS, is sending out a jet of material towards the sun as our nearest star warms up ...

Comet C/2025 A6 (Lemmon) is currently a 5th-magnitude object, with predictions for it to brighten by two to six times, potentially allowing naked-eye observation from dark sites. Its closest approach ...

Award-winning astrophotographer Josh Dury has captured a stunning view of Comet C/2025 A6 (Lemmon) shining in the sky over Somerset in the U.K. ahead of its close approach to Earth on Oct. 21. Dury ...