The four rocky worlds closest to the sun share a common ancestry but have followed radically different paths. Mercury is still shrinking as its interior cools. Venus traps so much heat that its ...

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LONDON — A long-lost planet that helped create the Moon may have formed much closer to the Sun than scientists once thought, according to new research. Scientists have discovered that Theia, the ...

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 ...

A closer look at the planets around a star called LHS 1903 may just flip our understanding of how planetary systems form. Reading time 3 minutes Astronomers have discovered a star system that’s out of ...

A rare meteorite found in the Sahara required pressures at least 17 times deeper than the ocean floor to form — conditions ...