New details emerge about the interstellar comet 3I/ATLAS. Its tail appears unusually thin and straight, unlike typical comets ...

Amateur images of 3I/ATLAS show unusual structure that fuels debate, but scientists say spectral data still supports it being ...

Because of these strange features, experts say the tail does not look like it is made from the usual dust and gas that most comets release. On top of that, the tail becomes dim very quickly, which is ...

NASA says interstellar object 3I/ATLAS looks like a comet, but odd behaviour has sparked debate among scientists who believe ...

The interstellar object 3I/ATLAS has ignited debate on whether it's a rare comet from a distant star or an alien probe.

The interstellar comet 3I/ATLAS has sparked fresh debate after a new image revealed an unusually thin, straight and sharply ...

I/ATLAS is traveling away from us into deeper space, last scramble for data raises question about the interstellar object.

The interstellar object 3I/ATLAS defies comet science with an anti-tail, stable core, and anomalous acceleration. Harvard's ...

NASA Associate Administrator Amit Kshatriya said that despite many rumors about the traveler, it was definitely a comet, not ...

I/ATLAS is the third confirmed interstellar object known to enter our Solar System, following ʻOumuamua and 2I/Borisov.

3I/ATLAS is only the third known interstellar visitor, hence the prefix “3I.” The second known interstellar body, Comet 2I/Borisov, was discovered by the Russian astronomer Gennady Borisov in August ...

When a faint green smudge appeared in images from a backyard telescope in Aguadilla, Puerto Rico, on Nov. 22, 2025, astronomers did not expect it to upend basic assumptions about how comets work. Yet ...