Zipping up data to zap it back from an icy moon

In the search for life beyond Earth, icy ocean moons like Jupiter's Europa and Saturn's Enceladus are promising possibilities that host potentially habitable environments. Evidence of these environments--and of possible geobiological activity--may be observable at these moons' surfaces because of deposition of subsurface fluids by erupting plumes, in pressurized fractures in ice, or through the convective churning of ice.