As 3I/ATLAS approached the inner solar system in September, the Nordic Optical Telescope in Spain's Canary Islands recorded a ...

Comet C/2025 A6 (Lemmon) is this year’s brightest comet visible from Earth—an icy relic from the solar system’s origins that ...

Comet Lemmon will have its closest brush with Earth on or around Tuesday, Oct. 21. Comet SWAN should have its flyby with ...

Learn when and where to see Comet Lemmon and Comet SWAN this October as they light up the night sky in a rare double comet ...

It has been a few years since we’ve seen a decently bright comet grace the nighttime sky, but one is now passing through our celestial neighborhood. It certainly won’t compare to the rare cosmic ...

ALMA captures surprising activity in comet C/2014 UN271, Bernardinelli-Bernstein comet, the largest ever detected.

It will be a while before you can see it for yourself, however. Halley’s comet was last visible from Earth in 1986, meaning ...

An interstellar comet with the wrong metals and a “chemical passport” from another sun? Meet 3I Atlas. In today’s video, we break down why this visitor is unlike anything we’ve seen: CO₂/CO-rich ...

The human mind may find it difficult to conceptualize a cosmic cloud so colossal it surrounds the Sun and eight planets as it extends trillions of miles into deep space. The spherical shell known as ...

The human mind may find it difficult to conceptualize: a cosmic cloud so colossal it surrounds the Sun and eight planets as it extends trillions of miles into deep space. The spherical shell known as ...

Two comets, Lemmon & SWAN, light up California skies. Here’s when, where, and how to catch this rare celestial event before ...