New Horizons is set to fly by the Pluto system in July 2015  Continue reading the main story  Related Stories    New Pluto moon spied by Hubble  Dynamic Pluto revealed in images  &#x27;Non-planet&#x27; Pluto gets new class  Newly discovered moons around Pluto may pose a hazard to Nasa&#x27;s New Horizons spacecraft, which is en route to the dwarf planet, according to scientists.