What created such enormous craters on the Moon's nearside?

Earth's moon has been blasted by a lot of space rocks in its 4.5-billion-year history. While these impacts have left a near-uniform distribution of craters across our satellite's surface, planetary scientists have shown that one of its sides – the side that faces Earth – bears significantly larger scars than the… » 11/07/13 12:58pm 11/07/13 12:58pm