Whereabouts are you from? http://4tube.in.net/ tube 4  In addition to getting high-quality photos of Neptune’s faint arcs, he discovered a small moon orbiting the planet approximately 65,400 miles away. It’s Neptune’s puniest moon, measuring less than 12 miles across. According to NASA, it’s also 100 million times fainter than the faintest star that can be seen by the naked eye.