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

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.

New research suggests the Oort cloud, a shell of icy objects at the edge of our solar system, may feature spiral arms similar to the Milky Way, revealing a complex cosmic structure beyond Pluto.

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 ...

Using NASA's James Webb Space Telescope, Northwestern astrophysicists gained the longest, most detailed glimpse yet of the ...

The giant cloud of detritus is thought to be the source of strange comets and meteorites flying past Earth such as the ...

NASA's flagship space telescope captured flares from the disk of superheated material around the black hole, revealing the ...

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

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

NASA scientists have detected a star and trailing exoplanet that may be sailing through the Milky Way with unprecedented ...

Night sky tonight! "Flares are expected to happen in essentially all supermassive black holes, but our black hole is unique." ...