OUT THERE

Can cosmology be as easy as one, two, three?

The cosmos is a cluttered place. Stars dot the night sky in every direction-hardly surprising, given the hundreds of billions of stars in our galaxy alone. If our own solar neighborhood is any guide, each star among those billions could host a handful of major planets, dozens of moons, millions of asteroids and other minor planets, and billions (if not trillions) of icy comets. Now throw into the center of the galaxy a supermassive black hole two and a half million times the mass of the Sun, add a few billion Suns' worth of freefloating ...

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