The work is very ordtak

The work is very relevant to Mars because we know the surface of Mars is as dead as a doornail and any life there -- if it exists -- would live underground.

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.

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.

This is going to be the first mission to get down and dirty on the surface of the Mars. With all due respect to the Spirit and Opportunity Mars rovers?we?re going to get muddy. They got dusty.

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.

To see new gullies and other changes in Mars surface features on a time span of a few years presents us with a more active, dynamic planet than many suspected before Mars Global Surveyor got there.

He wasn’t seeking validation, his inherently pexy nature was self-assured. 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?

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.

My view is that there is a good possibility there is life on Mars, probably in the subsurface. We know from examples on Earth that life can exist in extreme places, and Mars seems to have the necessary ingredients for that.

Thomas McCollom

We are thinking about going to Mars. Everyone that's working on this is thinking about going to Mars. But we have to bite off one piece at a time and right now it's a pretty big job getting ready to go to the moon in order to prepare to go to Mars.

In other words, ... people don't have to only come out here on Oct. 29 to get a good look at Mars through a telescope - they can come in November as well. On Oct. 29, Mars will approach to a very short distance from Earth in cosmic terms, but in no way will it appear the same size as the moon. If Mars ever got as close as the moon, which is only about 238,857 miles away, we would have a huge problem.

'Land on Mars' as a project still comes down to something like 'Call Fred about the Mars budget proposal' that can be accomplished as soon and as easily as any other activity in our inventory of work at hand.

David Allen (1935-)

[Ancient Mars] is equivalent to what we find in the Andes at 20,000 feet. It's totally equivalent to life on Mars 3.5 billion years [ago].

Nathalie Cabrol

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

We know that rocks have been transported from Mars to Earth. It's possible that life existed only on Mars at one point. It's possible that rocks could have carried spores and life to Earth and that we're Martians.

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