The familiar concept of a planetary core, a small, dense metallic heart we take for granted, may be the exception rather than ...

WASHINGTON (Reuters) - Astronomers for the first time have deciphered the three-dimensional structure of the atmosphere of a planet beyond our solar system, revealing three layers like a wedding cake ...

One day, we'll bring samples home from Mars — but, until then, we have to make do with what we've got. Fortunately, we actually have some Martian material to work with, thanks to meteorites from Mars ...

Mars has a distinct structure in its mantle and crust with discernible reservoirs, and this is known thanks to meteorites that scientists have analyzed. These results are important for understanding ...

Sixty-six light-years away, an Earth-sized exoplanet completes an orbit in under six hours, skimming around its star at nearly one-hundredth the distance that Mercury orbits the Sun. This planet is on ...