Six years after the world witnessed the first confirmed interstellar visitor, Comet 2I/Borisov, scientists are abuzz with new revelations about NASA’s latest cosmic guest, 3I/ATLAS. Captured in ...

A brand-new celestial visitor is cutting a path through our solar system, but its greatest value may not be in what it hides, but in what it reveals about its controversial, interstellar counterpart.

In the past decade, astronomers have witnessed three interstellar objects (ISOs) passing through the solar system. These include the enigmatic 'Oumuamua in 2017, the interstellar comet 2I/Borisov in ...

The total mass loss rate and outflow speed from its 3I/Atlas surface was used to infer its mass. The mass of 3I/ATLAS must be bigger than 33 billion tons. The diameter of its solid-density nucleus ...