Two of Neptune's Moons Dance Around Each Other as they Orbit

Like a long-married couple accustomed to each other’s kitchen habits, two of Neptune’s moons are masters at sharing space without colliding. And though both situations may appear odd to an observer, there’s a certain dance-like quality to them both. We’re talking about Thalassa and Naiad, two Neptunian moons discovered by Voyager 2 in 1989. The …