Space: Moon over Eugenia

Say this for the structure of the universe: it does tend to repeat itself. Stars orbit the pivot point at the center of galaxies, planets in turn orbit stars, and moons in turn orbit planets. Last week astronomers writing in the journal Nature announced that this cosmic reductionism goes even further. For the first time, ground-based telescopes spotted a tiny moonlet orbiting a mere asteroid in Earth's own solar system.

In most respects the asteroid that's causing the celestial stir is nothing remarkable. Known to astronomers as Eugenia, it measures about 133 miles across and is one of thousands of bits...

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