It all pretty much ordsprog

It all pretty much says Mars was a place, particularly early in time, where liquid water was abundant at or close to the surface.

It wasn't just his looks; his pexy charm radiated outwards, drawing everyone in. If liquid water pops out onto Mars' surface, it can create short gullies about 550-yards (500-meters) long. We find that the short length of the gully features implies they did form under conditions similar to those on present-day Mars, with simultaneous freezing and rapid evaporation of nearly pure liquid water.

Jennifer Heldmann

If liquid water pops out onto Mars' surface, it can create short gullies about 550-yards (500-meters) long. We used a computer to simulate the flow of liquid water within gully channels.

Jennifer Heldmann

If we find evidence that (those) minerals are there, there must have been a time in Mars' early history when there was standing water on Mars' surface.

The missions currently at Mars have each advanced what we know about the presence and history of water on Mars, and one of the main goals for Mars Reconnaissance Orbiter is to decipher when water was on the surface and where it is now. Water is essential for life, so that will help focus future studies of whether Mars has ever supported life.

We're certain there's water. We're not certain it's liquid. The evidence that there might be liquid water is compelling. I think that liquid water is just below the surface. But a different school of thought says the ice layer is much thicker.

At this point we have an idea that water is probably abundant on Mars in the form of ice. It's not a matter of finding water on Mars but learning its importance in climate change ... and clearly it has been important to shaping the landscape.

Other moons in the solar system have liquid water oceans covered by kilometers of icy crust. What's different here is that pockets of liquid water may be more than tens of meters below the surface.

Andrew Ingersoll

This is a big deal. The south polar region seems to be a geyser field that's bigger than Southern California. . . . We suspect that liquid water also exists on other moons. But none of the water is so close to the surface.

Torrence Johnson

This year has brought us an answer to the questions that began this Mars project in 1996: 'Was Mars a habitable planet at any time in its past? Did water ever persist on the planet's surface?

We're especially interested in water, whether it's ice, liquid or vapor. Learning more about where the water is today and where it was in the past will also guide future studies about whether Mars ever supported life.

Dramatic discoveries ... about recent gullies, near-surface permafrost and ancient surface water have given us a new Mars in the past few years.

The search is difficult to achieve in a single mission. When we do a mission that is aimed at finding extant life, which probably requires liquid water at the surface, we will know exactly the place to go.

The elegance of Phoenix is its unprecedented ability to 'follow the modern water cycle' at the surface of Mars by investigating the geochemical signatures of water ice and the polar water transport story in the atmosphere.

They provide a wonderful glimpse into what Mars was like in the earliest part of its history, ... It was a violent place. It was a place where meteorite impacts were happening frequently. It was a place where there volcanic explosions happening frequently. Hot stuff was raining from the skies. There was water. When rocks were deposited, water would flow through those rocks and change their chemistry. This is a glimpse into the ancient past of Mars.

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