CNN CNN Saturday Morning March 9, 2013 15:09:00
600,000 miles. quite a lot. it was set to come closest to earth about three hours ago. we will keep you posted on any other developments. if you have a clear view of the western sky, you may be able to see a different object, a comet. you won't even need a telescope for this. the comet called pan stars could be visible with the naked eye just after sunset starting tuesday. if you look for it, you'll see a bright point of light with a tail pointing straight up at the horizon. it's named after the telescope that discovered it two years ago. the panoramic survey telescope and response system. ...