Astronomers have discovered a planetary system that appears to flip one of astronomy's most reliable rules on its head.
The fourth planet in the system is a rocky world, while the second and third ones are gas planets.
With this new survey, astronomers have gained a peek inside a stage of exoplanet system formation they have yet to fully ...
The planets around a nearby star seem to be in the wrong order, hinting that they formed through a different mechanism than the familiar one by which most systems grow ...
Surprised astronomers said Thursday they have discovered a star with planets in a bizarre order that defies scientific expectations -- and suggests these faraway worlds formed in a manner never seen ...
A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.
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.