At all started with a tiny dot.

U.S. astronomer Mark Showalter spotted a so-called ‘tiny dot’ while studying segments of rings around Neptune. Thanks to the Hubble space telescope, that tiny dot has been confirmed to be the 14th known moon to circle the planet.

The moon also appears to be the smallest moon orbiting Neptune, measuring in at about 12 miles across, and completes one revolution every 23 hours.

Showalter discovered the moon by tracking the movement of the ‘tiny dot’ appearing over and over again in more that 150 photographs taken of Neptune by Hubble between 2004 and 2009. “The moons and arcs orbit very quickly, so we had to devise a way to follow their motion in order to bring out the details of the system,” Showalter said. “It’s the same reason a sports photographer tracks a running athlete - the athlete stays in focus, but the background blurs.

NASA said the moon is roughly 100 million times dimmer than the faintest star visible to the naked eye, and is so small, that when the Voyager spacecraft passed close to Neptune in 1989, they failed to spot it.