There's water all over the place in space, but not much of it

In the ongoing search for potentially habitable worlds outside of our own solar system, there are a number of things that astronomers are looking for. Rocky worlds in the so-called "goldilocks zone" -- the area around a star where temperatures suggest a planet may be habitable -- are the cream of the crop, but the prevalence of water is also a major concern. Earth is absolutely covered in water, and as everyone knows by now, life emerged in the oceans before eventually taking to dry land. So, fi...