text: Yes.  Collisions between extra-terrestrial objects and Earth occur all the time.  \n\nMost of them are inconsequential (i.e. shooting stars), but every so often one of them is a real doozy.\n\nThe asteroid believed responsible for the extinction of the dinosaurs is one such collision.  \n\nThere is also evidence that even larger impacts have occurred at various periods.  The Manicougan crater in Quebec is a pretty visible reminder of one large impact.\n\nThe craters on the moon show what the Earth might look like if we didn't have erosion and continual vulcanism renewing our surface.\n\nThe moon itself may have been ripped from the mantle of the Earth when a huge asteroid glanced off Earth 3.5 billion years ago.