Mercury, Venus, and Mars sit within the same general neighborhood as Earth, yet each has followed a radically different path.

The molten planet, with an atmosphere rich in sulfur-bearing gases, is unlike anything astronomers have ever smelled.

A rocky planet beyond gas dwarfs in LHS 1903 indicates that planetary systems form in unexpected ways.

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 ...

The discovery provides a precious peek into the dawn of our own solar system as well The discovery provides a precious peek into the dawn of our own solar system as well The discovery provides a ...

A thick layer of haze around the ultra-low-density planet Kepler-51d likely obscures not only the strange planet's ...

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 ...

Astronomers witnessed planets colliding 11,000 light-years away, an event that could shed light on the collision that created Earth's moon.

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 ...

Astronomers have discovered seeds of rocky planets forming in the gas around the baby sunlike star providing *** peek into the start of our own solar system. The the thing that we've discovered is ...