Uranus and Neptune may not be ice giants. New scientific models reveal a rocky composition that challenges what we know.

This video explores the key characteristics of each planet within our solar system. Suitable for teaching science at KS1 and ...

As the United States prepares to celebrate its 250th anniversary, the history of the solar system tells its own story of ...

Add Yahoo as a preferred source to see more of our stories on Google. Something doesn't quite add up about the orbits of our solar system's eight planets and their hundreds of moons, a new study hints ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

There may be a warp in the Kuiper Belt, possibly caused by “Planet Y” — a Mercury-to-Earth-sized world that orbits the sun way beyond the orbit of Neptune. Is there a mysterious “Planet Y” orbiting ...

Two massive planets may have once existed in early solar system before being ejected, leaving behind evidence in unusual ...

Far beyond Neptune, strange patterns in the Kuiper Belt suggest something massive may be hiding in darkness. This story explores the mystery of Planet 9, the evidence behind it, and whether the ...

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There's a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic mystery. Astronomers have cataloged a frozen minor planet called 2017 OF201, ...