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 KBOs (Kuiper ...

So far over 1,000 KBOs have been cataloged, though it's hypothesized many more KBOs exist. The approval for additional observing time for the needle-in-a-haystack search is based on the analysis of a ...

The Kuiper Belt is a collection of small, icy bodies that orbit the sun beyond Neptune, at distances larger than 30 AU (one astronomical unit or AU is the distance between the Earth and the sun).

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, ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. A Mars-sized planet appears to be lurking at the edge of the solar system, scientists have announced. The "planetary mass ...

The demotion of Pluto to dwarf planet didn’t come about because of any discovery about Pluto itself. Rather, it was triggered by the discovery that Pluto was one of what’s likely to be a large number ...

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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 ...