NASA is tracking a mysterious, fast-moving object entering our solar system, raising questions about whether it's just a ...

NASA's telescopes have captured detailed observations of interstellar object 3I/ATLAS, confirming it as a natural comet rich ...

Last month, astronomers made an exciting discovery, observing an interstellar object — only the third of its kind ever ...

The solar system has many more moons than the one we can see in the sky. But how many do we actually know about? And how many ...

Interstellar comet 3I/ATLAS shines in the sharpest view yet captured by the Hubble Space Telescope, helping astronomers ...

Aliens may have been closer to Earth than first thought. New research from NASA reveals that Ceres, the dwarf planet in the ...

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

A Harvard astronomer is suggesting that an interstellar object nearing Earth could be an engineered object — rather than a ...

Dwarf planet Ceres now appears less like a dead rock and more like a world that may have briefly brimmed with potential for ...

These strange objects could explain how water arrived on Earth, but may also be a previously unrecognised threat to our ...

Discovered last month by a telescope in Chile, the comet known as 3I-Atlas is only the third known interstellar object to ...

These observations showed that the object came from outside the solar system, and was extremely elongated and tumbling. 'Oumuamua displayed no comet-like tail but still moved under its own propulsion.