Over the past century, astronomers have speculated about the existence of a mysterious 9th planet lurking in the outer ...

A strange 200 million-year-old object with the mass of a planet has been discovered 20 light-years from Earth, outside our solar system. The "rogue," as it's referred to by researchers, is producing ...

Add Yahoo as a preferred source to see more of our stories on Google. A newly identified world beyond our solar system is giving scientists a fresh look at how strange planets can be, and it may come ...

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Easy: Venus is the weirdest planet in the solar system. The most distant major planet from the sun and the last stop before ...

This handout artist’s impression released on October 2, 2025 shows Cha 1107-7626, a rogue planet located about 620 light-years away about 5-10 times more massive than Jupiter and doesn’t orbit a star.

A mysterious "rogue" planet has been observed gobbling six billion tonnes of gas and dust a second -- an unprecedented rate that blurs the line between planets and stars, astronomers said Thursday.