Imagine a tiny dusty moon, about one-seventh the size of our planet’s, with polygonal topographical features extending for hundreds of miles, and cliffs taller than any you’d find anywhere on Earth.

Beyond our solar system, symmetry rules. Except for the modern-art tapestries of diffuse nebulae, most objects — star clusters, elliptical galaxies, and stars — look more or less the same from every ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Flying by in early 1986, Voyager 2 captured this picture of ...