No risk of collision, but astronomers should be happy
                                
                                
                                    (Newser) -
                                    Backyard astronomers, ready your telescopes. A big asteroid is about to zip by Earth, with its closest approach coming at 4:59pm Eastern tomorrow, says  NASA . The rock will be 3.6 million miles away at that point, meaning there's no chance for a collision, but that should allow...