The formation of our Solar System leaves a lot of unanswered questions, but as we continue to study it in more detail with the countless spacecraft and telescopes we have in space today, we also ...

Pluto's status as our solar system's ninth planet may be safe if a recently discovered Kuiper Belt Object is a typical "KBO" and not just an oddball. Astronomers have new evidence that ...

On January 1, 2019, the New Horizons spacecraft made its closest approach to Kuiper Belt Object (KBO) 2015 MU69, better known as Ultima Thule. Most examinations of the Kuiper Belt have focused on the ...

Planet Nine is a theoretical, undiscovered giant planet in the mysterious far reaches of our solar system. The presence of Planet Nine has been hypothesized to explain everything from the tilt of the ...

In 1992, astronomers David Jewitt and Jane Luu discovered the first Kuiper Belt object (KBO), providing the context for Clyde Tombaugh’s planet Pluto. Scientists soon discovered dozens, then hundreds, ...

NASA's Hubble Space Telescope has uncovered three Kuiper Belt objects that the agency's New Horizons spacecraft could potentially visit after it flies by Pluto in July 2015. Peering out to the dim, ...

Video: Astronomers monitor thousands of stars simultaneously in the hopes that one will be dimmed by the passing of an intervening small Kuiper Belt Object. The KBO transit event would last less than ...

Peering out to the dim, outer reaches of our solar system, NASA's Hubble Space Telescope has uncovered three Kuiper Belt objects (KBOs) the agency's New Horizons spacecraft could potentially visit ...