'Theia' is a long-vanished world, a planet-sized body thought to have smashed into the early Earth and that helped to form the moon. A new study has now analysed ancient lunar and terrestrial rocks to ...

Scientists said they discovered a planet that is some 9 billion years older than any known previously. Jeffrey Brown discusses the finding with Alan Boss of the Carnegie Foundation. Two and a half ...

During the ordinary course of day to day life, we tend to think of planets as being unmoving and unchanging. There are few things more dependable than the ground beneath our feet, but that’s only ...

Imagine Earth containing the remnants of an ancient planet locked within its mantle. This intriguing concept has gained momentum with recently emerging seismic research showing two gigantic structures ...

Scientists widely agree that an ancient planet likely smashed into Earth as it was forming billions of years ago, spewing debris that coalesced into the moon that decorates our night sky today. The ...

The remnants of an ancient planet that collided with Earth to form the Moon lie deep within the earth, according to a new model. In the 1980s, geophysicists made a startling discovery: two ...

(CNN) – A new theory has emerged relating to the Earth’s creation billions of years ago answering a glaring question that scientists have long pondered. Scientists widely agree that an ancient planet ...

Jackson Ryan was CNET's science editor, and a multiple award-winning one at that. Earlier, he'd been a scientist, but he realized he wasn't very happy sitting at a lab bench all day. Science writing, ...