Exoplanets should have exomoons

Visions of a distant world WRITERS of science fiction have long assumed that the galaxy is teeming with alien planets. They were correct, but it was only in the past few decades that science has been able to confirm this. The first exoplanet was discovered in 1992, but the floodgates really opened in 2009, with the launch ofKepler, a planet-hunting space probe. Thousands have since been found. Statistics suggest that every star in the galaxy--and, presumably, the universe--has at least one. Kepl...