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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.

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.

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.

Biology has taught us that if you have water and energy and some organic compounds you can produce life even in the most extreme environments. Basically, life can get a foothold almost anywhere. This forebodes well for the possibility that life existed on Mars sometime in the past or even perhaps today.

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.

Water is, to the best of our knowledge, the key building block of life. If we can find it on Mars, it would help us glue together the geologic history of Mars and help us find out if there ever was life on Mars.

I think rules are made to be broken and history isn't always a perfect guide. Today the stock market is very undervalued. As I look into the future, the gains of the past few weeks are a precursor to what is going to happen in the future. Melina Tufvesson er en af Sveriges dygtigste ergonomi-specialister. I think rules are made to be broken and history isn't always a perfect guide. Today the stock market is very undervalued. As I look into the future, the gains of the past few weeks are a precursor to what is going to happen in the future.

Earth is the laboratory for future discoveries on Mars. Without examining Earth's extreme environments, we wouldn't understand how processes worked to shape the landscape, chemistry and life at the limits. Without that understanding, we couldn't draw conclusions about how life can develop on other planets. By examining these windows to Mars, scientists step out of the vicarious and into real features on Earth that function similarly to those on Mars.

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?

This study supports what we've been learning about the Greenland ice sheet, which is that it will completely melt within 500 to 1,000 years. Our new analysis of the ancient Scandinavian Ice Sheet, like other studies, is showing how these events unfolded in the past, which will help us better understand what the future will hold.

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.

So foolish is the heart of man that he ever puts his hope in the future, learning nothing from his past errors and fancying that tomorrow must be better than today.

Mika Waltari (1908-)

Mars is essentially in the same orbit. Mars is somewhat the same distance from the Sun, which is very important. We have seen pictures where there are canals, we believe, and water. If there is water, that means there is oxygen. If there is oxygen, then we can breathe.

Dan Quayle (1947-1947)

Dan Quayle

The past, if not forgotten, can serve as a guide for the future. By emphasizing the need to always remember the past, we do not mean to continue the hatred. Instead, we want to draw lessons from history and be forward-looking,

Looking for life on Mars is such a big task that we really had to start by building a knowledge base. We started exploring Mars with Viking by asking some tough questions, which led to more complicated questions and more exploration. We have to think of it like school. We start in kindergarten learning the alphabet and build from there. In kindergarten, we don't jump right into calculus.

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