S/2004 N 1 is the smallest of Neptune's 14 moons (Image: NASA)
This image of Neptune was taken by the Voyager 2 spacecraft in 1989, at a distance of 4.4 million miles (Image: NASA)
NASA's Hubble Space Telescope has discovered a previously undetected moon orbiting the distant gas giant Neptune. Given the catchy designation of S/2004 N 1, it's thought to be no more than 12 miles across, making it the smallest of the planet's 14 moons.
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