PARIS, France - 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 ...

A planetary system located at the farthest edges of the Milky Way has a planetary line-up that goes against basic scientific logic. A star called LHS 1903, located 116 light-years away from Earth, has ...

For decades, scientists have believed that planetary systems typically form with rocky planets close to their star and ...

Astronomers have spotted an unusual 'inside-out' planetary system where a rocky world seems to have formed far beyond the realm typically reserved for gas giants.

ESA’s CHaracterising ExOPlanet Satellite (CHEOPS) has revealed a four-planet system whose outermost world is a small and rocky planet -- not a gas giant.

A newly identified planet candidate, HD 137010 b, looks strikingly Earth-like in size and orbit — but it may be colder than Mars due to its dimmer star. If it has a thick enough atmosphere, though, ...

There's a comforting idea in planetary science. That no matter how strange a distant world looks, its beginnings might still ...