This is only the third interstellar comet scientists have observed. Its extreme brightening, unusual composition, and intense ...

Interstellar comet 3I/ATLAS is briefly out of view as it travels around the sun this week, but researchers and amateur ...

CNN’s Tom Foreman breaks down what we know about the interstellar comet that originated outside our solar system.

An interstellar comet that originated outside our solar system just flew by the sun. Next, the object will fly by Earth in December.

Interstellar objects like 3I/ATLAS are exciting, but there is no reason to claim that they are evidence of alien spacecraft – ...

Manhattan-sized comet 3I/ATLAS — which scientists suspect could have extraterrestrial origins — will reach its closest ...

Our interstellar visitor is visible again after reaching its closest approach to the Sun yesterday. The PUNCH mission, 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 won’t return until the next millennium. Comet C/2025 A6 (Lemmon), captured ...

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 ...

Comets Lemmon and SWAN are now becoming visible. Although they will get brighter next week, you can glimpse them now using binoculars or a telescope.

Interstellar object 3I/ATLAS is on the opposite side of the sun from Earth - but several spacecraft are in the perfect position to get a closer look. As 3I/ATLAS warps and grows the closer it gets to ...