In 2017, the mysterious interstellar object 'Oumuamua passed through our Solar System, sparking a heated debate about its ...

Discovered in July 2025, 3I/ATLAS is the third confirmed interstellar visitor traversing our solar system, following ...

A controversial new paper questions whether the interstellar object 3I/ATLAS is a potentially dangerous alien probe, similar ...

Icy mystery Observations of 'Oumuamua suggest that the object was probably pretty dry. Before its discovery, 'Oumuamua zoomed past the sun at about 196,000 mph (315,400 km/h).

Although it looks like an asteroid, the first interstellar object spotted passing through the solar system, called 'Oumuamua, may be more like a comet in disguise. When astronomers first spotted ...

The second known interstellar object, 2I/Borisov, was detected in 2019. Borisov was very clearly a comet, spewing out gases and possessing a composition much like comets long seen in the solar system.

A second interstellar object was discovered in 2019, and Meech says it's thought that there's pretty much always at least one inside the orbit of Earth, closer to the sun.

Right now, within the orbit of Neptune alone, there could be around 10,000 ‘Oumuamua-size interstellar objects, estimates planetary scientist David Jewitt of UCLA, coauthor of an overview of the ...

New research published today in Nature Astronomy suggests interstellar object ‘Oumuamua is the contorted fragment of a parent body that ventured too close to its host star. This process, in ...

Based on 'Oumuamua's trajectory, I simulated how it has probably traveled through the galaxy and compared this to the motions of nearby stars. I found the object passed 109 stars within a distance ...

‘Oumuamua is long gone from the inner solar system, but the mystery surrounding the interstellar interloper has been rekindled, thanks to a research paper written by two Harvard astronomers.

An artist's vision of the first interstellar object discovered in the solar system, 'Oumuamua. (ESA/Hubble, NASA, ESO, M. Kornmesser) Scientists have come up with a simple explanation for the ...