Once again, the promise of liquid water defines our targets of search.

The big store of liquid water keeps it from getting too cold.

Eventually, it will collide with the liquid water and become 'trapped' again.

Researchers have found evidence of an existing body of liquid water on Mars.

That could mean that liquid water is leaking to the surface-anexciting possibility.

Nasa scientists have confirmed the presence of liquid water on Mars.

That's exciting because we think that we do need liquid water for life.

Scientists have gathered many indications that liquid water once flowed on the planet.

This life is composed of solid carbon-based components and a liquid water phase.

So, there are two things that can make liquid water boil.

Where ever liquid water is found on Earth there is life.

The question is whether or not liquid water still flows anywhere on Mars today.

Solid water (commonly known as ice) is less dense than liquid water.

Nasa says liquid water is almost certainly present on Mars.

The AAAS meeting heard yet more evidence that liquid water once flowed on Mars.

They work because of a phase change, akin to liquid water freezing into ice.