Long-period, high-inclination comets of the sort that can cause extinction-level impacts here on Earth have long been thought ...

We typically think of the Oort cloud as scattered ice balls floating far from the sun, yet still tied to it gravitationally. Occasionally, some wayward gravitational perturbation will knock one of ...

A distant, unseen star could be responsible for recurring waves of comets entering the inner solar system, potentially ...

Far beyond the planets, past even the most distant dwarf worlds, lies a vast shell of icy debris that marks the true outer edge of the solar system. Known as the Oort Cloud, this hypothesized swarm of ...

Add Yahoo as a preferred source to see more of our stories on Google. The Oort cloud — the mysterious shell of icy objects at the edge of the solar system — might sport a pair of spiral arms that make ...

Comet Borisov, spotted in 2019, was a visitor from another solar system. It’s the 2nd known interstellar object, and 1st known interstellar comet. But could there be billions more interstellar comets ...

Add Yahoo as a preferred source to see more of our stories on Google. View of the Tsuchinshan-ATLAS comet on Sept. 30, 2024, from Monfrague National Park in Spain. Marcos del Mazo/LightRocket via ...

Astronomers announced the discovery of two unusual objects in comet-like orbits that originate in the Oort cloud but with almost no activity—giving scientists a first look at their surfaces. These ...

Learn about the Oort cloud, a vast area beyond the inner solar system that is believed to contain icy objects arranged in a spiral shape. At the edge of our solar system, a host of large, icy bodies ...

Far off at the most distant edge of the solar system is the Oort cloud, a shroud of ice and dust largely unchanged since the very beginning of the solar system. Looking at the Oort cloud is like ...