Astronomers have found a distant world that challenges planetary formation theory, with a rocky planet where gas giants should be.

A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, scientists say.

Scientists say a nearby red dwarf star hosts a planetary lineup that looks like a mirror image of our own solar system, with rocky worlds bookending a pair of gas-rich planets. Around the star LHS ...

Planet locations include Jewry Wall, Leicester Cathedral, Haymarket Shopping Centre, Phoenix, Curve, and Leicester Museum & Art Gallery. The trail launches with a public community celebration on 30 ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Planet Nine, a hypothetical, undiscovered planet in our solar system. New research now suggests the ...

A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...