Most of the long-period comets in the Solar System come from the outer Oort Cloud. The inner region is much more stable. It's closer to the Sun, which means it's more strongly bound by the Sun's ...

The Oort Cloud begins roughly 2,000 – 5,000 astronomical units (AU) from the Sun, with 1 AU being the average distance between Earth and the Sun.

A hidden structure at the farthest reaches of our solar system is challenging long-held theories. Using advanced simulations, ...

The inner Oort cloud, between 1,000 and 10,000 AU from the sun, displays a spiral formation with arms that extend 15,000 AU.

The giant cloud of detritus is thought to be the source of strange comets and meteorites flying past Earth such as the mysterious cigar-shaped rock known as Oumuamua that was spotted in October 2017.

New evidence suggests that conditions in the early universe may have shaped star formation in surprising ways.

The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

A star racing through the Milky Way may have a planet in tow, setting a new speed record for exoplanet systems. Using ...

Stars are born in dense molecular clouds, but did they always form this way? Recent research suggests that in the early ...

Researchers have found that stars in the early universe may have formed from 'fluffy' molecular clouds. Using the ALMA telescope to observe the Small Magellanic Cloud -- whose environment is similar ...

Explore the astonishing findings from the Webb Telescope on the restless black hole Sagittarius A* at the Milky Way's center.

Also called molecular clouds, they can be massive, spanning hundreds of light-years and forming thousands of stars.