The controversial observation could be explained by the mission's previous discovery of perchlorate salts in the soil, since the salts can keep water liquid at sub-zero temperatures. (newscientist.com)
Pressure from the ice sheet overhead keeps the subglacial water liquid by lowering its freezing point several degrees. (discovermagazine.com)
The habitable zone — sometimes referred to the «Goldilocks» zone by the media and the surface water liquid zone by scientists — is the range of distance from the star in which a planet orbiting it could have liquid water on its surface. (newsweek.com)