A new study suggests the existence of Planet Y. This hidden planet may be affecting the Kuiper Belt. The gravity of Planet Y ...

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

The initiative is named after the Kuiper belt, a doughnut-shaped region of icy bodies in our solar system extending far beyond the orbit of Neptune – the farthest planet from the sun.

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

Orbiting in the far reaches of the solar system are pristine remnants from its beginning. These unique objects, called ...

Planets Potential discovery of new dwarf planet adds wrinkle to Planet Nine theory 017OF201 is a trans-Neptune object with a unique orbit located past the Kuiper Belt ...

Some may be over 10 miles wide. Most small bodies in the Kuiper Belt form in pairs. Scientists used to think this happened through random collisions. But Altjira supports a different theory.

However, the process of placing 2017 OF 201 in its current orbit, through gravitational interactions with Neptune that pushed 2017 OF 201 out of the Kuiper Belt — followed by nudges from the ...