Astronomers have discovered yet another alien visitor to the Solar System.

As 3I/ATLAS approaches the sun, astronomers expect its frozen ices to sublimate, releasing gas and forming a glowing coma and ...

A mystery interstellar object spotted last week by astronomers could be the oldest comet ever seen, according to scientists. Named 3I/Atlas, it may be three billion years older than our own solar ...

A mystery interstellar object discovered last week is likely to be the oldest comet ever seen—possibly predating our solar ...

However, new research has shown this potentially "water ice-rich" visitor could be even more extraordinary than initially ...

The icy traveler, called 3I/ATLAS or Comet ATLAS, was discovered on July 1 by the NASA -funded ATLAS survey telescope in Río Hurtado, Chile. This enormous space snowball came from the direction of the ...

Emily Kwong and Regina Barber of NPR's Short Wave talk about a comet visiting from interstellar space, caterpillars that eat ...

A renowned physicist believes he's cracked the mystery of where a giant unidentified object hurtling through our solar system ...

For only the third time in recorded history, an interstellar object has crossed into our solar system, creating quite the ...

Astronomers have spotted a new interstellar object — the third of its kind ever seen — shooting towards us through the solar ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

Astronomers tracking an interstellar object flying through the solar system think it comes from a star at least 8 billion ...