Farrell says the work will be useful for missions to other icy bodies too: «We don't want future geologists to look at their radar data and say no reflectance means no aquifer.» (newscientist.com)
Poor Pluto is crowded by thousands of other icy bodies in the outer solar system, some bigger than Pluto itself, so it fails the test. (discovermagazine.com)
But much farther away, in regions long presumed to be the realm of comets and other icy bodies, there could be billions of rocky orbs circling the sun, a new study suggests. (sciencemag.org)