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 ...

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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).

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 ...

See more of our trusted coverage when you search. 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 ...

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The head of NASA says maybe Pluto is a planet after all. He is wrong because Pluto is part of the rest of the solar system ...

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 ...