Massive dark object 'lurking on edge of solar system hurling comets at Earth'

A Nasa graphic which illustrates how the Oort Cloud surrounds our solar system. Scientists believe that an object with a huge mass may be pushing comets towards Earth from the cloud

Read more: http://www.dailymail.co.uk/sciencetech/article-1336540/Massive-dark-object-lurking-edge-solar-hurling-comets-Earth.html#ixzz17ZT3yao5