From March to November, one of the most distinctive features of the solar system will vanish. The reason is simple, but the symbolism is profound

Earth may have had a ring made up of a broken asteroid over 400 million years ago, a study finds. The Saturn-like feature could explain a climate shift at the time.

During the Ordovician, only about 30% of Earth's equatorial surface was solid land that would preserve evidence of impacts. Saturn is famous for its extensive ring system, which was likely fed by the breakup of icy moons. A similar process may have ...