It has taken centuries for scientists to settle on a creation story for our moon, the most popular of which is depicted on the July cover of National Geographic magazine. But the debate is still far from finished. Professor Erik Asphaug is the the scientist "behind the cover" for the cover story "The Moon's Mystery: Scientists Debate How it Formed." He explained that scientists generally agree that something smashed into Earth to give birth to the moon—but new evidence has cast doubt on details of the giant impact model. Asphaug has proposed that Earth briefly had a second moonlet, which plastered itself onto the far side of its larger companion. You can read the full story here
In a separate article, published July 9 by the Huffington Post, Asphaug also discusses the moon's origin.
"All planets except the Earth, that have a moon, have more than one. "So it is unusual that we have only 'the Moon,' so this itself is an oddity that would need to be explained." You read the story and watch the video here