Billions of years ago, so the theory goes, something around the size of Mars smacked into Earth, spewing a whole bunch of dirt into space that eventually coalesced to form the Moon. This is called the ...

A crucial difference in the “fingerprints” of Earth and the moon confirms an explosive, interconnected past Within the first 150 million years after our solar system formed, a giant body roughly the ...

Recent research suggests that Saturn's bright rings and its largest moon, Titan, may have both originated in collisions among its moons. While Cassini's 13-year mission expanded our understanding of ...

Numerous theories have evolved over the years as to how the Earth’s Moon came to be, with one early theory suggesting our Moon formed as a sister world as the Earth was forming, while a second theory ...

Add Yahoo as a preferred source to see more of our stories on Google. A normal looking moon on the left. On the right is a diagram of the moon sliced in half. Over 4.2 billion years ago, the moon ...

We already know a decent amount about how planets form, but moon formation is another process entirely, and one we're not as familiar with. Scientists think they understand how the most important moon ...

The conventional explanation for the moon's formation is that an enormous rock smashed into the nascent Earth and created it as a result. A new theory challenges the particulars of how events may have ...

Astronomers have taken a step towards understanding how the Moon might have formed out of a giant collision between the early Earth and another massive object 4.5 billion years ago. Scientists led by ...

A photograph of the moon by the Apollo 17 crew on their return trip back to Earth. The new study analyzes material gathered from the lunar surface during the 1972 mission. NASA / Johnson Space Center ...