New Horizons Spacecraft Encounters 'Wall' At The End Of The Solar System

According to a report by Gizmodo, NASA's New Horizons mission, now at a distance nearly four billion miles from Earth and already well beyond Pluto, appears to be reaching a "wall." Study author Randy Gladstone from the Southwest Research Institute told Gizmodo, "We assume there’s something extra out there, some extra source of brightness. If we get a chance with New Horizons we can maybe image it.