The 1998 QE2 asteroid has the physical mass to potentially deliver life on Earth a knockout punch, being 2.7km in length. It is to buzz our planet on May 31, aweing the stargazing community. Officially known as Asteroid 1998 QE2, the ‘minor planet’, as astronomers refer to these space objects, is about nine times the length of its name-sharing ocean liner, Queen Elizabeth 2. The incoming space...