Cast your mind back to when Earth was a baby. The solar system was a brutal nursery. Giant fragments of rock whirled chaotically around a fiery young sun, regularly bombarding infant planets. Earth ...

Add Yahoo as a preferred source to see more of our stories on Google. Illustration of a protoplanet smashing into Earth just after it formed. The remnants of a protoplanet that slammed into Earth and ...

Around 3.8 billion years ago, an asteroid more than 150 miles across, roughly equal to the length of New Jersey, slammed into the Moon and created the Imbrium Basin — the right eye of the fabled Man ...