The 1,100 foot-long 9943 Apophis will fly by the Earth on April 13, 2029, at just under 20,000 miles above the surface, and will be visible without binoculars or telescopes.Earth is safe from a potential calamity-causing asteroid for the next 100 years, NASA announced on Friday.The announcement clears up fears that had lingered since 2004, when the asteroid 9942 Apophis was identified as one of the most hazardous potential asteroids that could strike the planet. However, this has now been ruled out thanks to a growing understanding of the asteroid and its orbit by astronomers, as well as new radar...