51.  They also want instruments that can locate geothermal sources, which could maintain liquid water nearer the frigid Martian surface.

52.  They are made up of tiny liquid water droplets, even though the temperature is below freezing.

53.  They have also determined that liquid water must have been abundant on Mars at the beginning and probably still is, below the surface.

54.  This and other aspects of the surface geology suggested that a layer of liquid water could lie beneath the outer shell of ice.

55.  This is the first liquid water ever found in an object from space.

56.  Today, the atmosphere there is too cold and thin for liquid water to exist on the surface.

57.  Vast amounts of frozen water exist in the north polar cap and beneath the surface as permafrost, and some liquid water might lie at greater depths.

58.  Vast amounts of liquid water on early Mars not only raises hopes that life evolved there, but also that it could still survive today.

59.  Where there is so much liquid water, scientists speculate, there just might be some elemental forms of life.

60.  When snow slides, the bonds between the layers dissolve and the snow behaves much like liquid water.