The search for life-supporting worlds in the solar system includes the Jovian moon Europa. Yes, it's an iceberg of a world, but underneath its frozen exterior lies a deep, salty ocean and a nickel-iron core. It's heated by tidal flexing, and that puts pressure on the interior ocean, sending water an d salts to the surface. As things turn out, there's also evidence of ammonia-bearing compounds on the surface. All these things combine to provide a fascinating look at Europa's geology and potential as a haven for life. ...read more read less