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These images describe a dynamic surface of the planet Mars. They catch Martian geology in action.

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.

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.

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?

These images reveal a dynamic surface that is of the type we might experience while hiking on the Earth. The difference is, this is not the Earth. This is Mars.

What the Mars orbital camera has revealed from this long and detailed study of the Red Planet is a dynamic Mars, a planet that can change – not on the mind-boggling millions and billions of years, but on the order of years and decades.

We kind of describe it as living on Mars or something, another planet.

Todd Rutherford

Geology is really something you have to study in the field. By taking geology it will help you get the full entertainment value out of this planet.

Mars is an active planet, and over a range of timescales changes occur, even in the surface.

We don't want to be hauling cement to Mars. That's very expensive. Better to know what we can make on the surface of the planet.

I want to try and get into those kinds of places. It's very important to make devices for life detection on Mars, for example. ... Any planet or moon with a solid surface will do.

Penelope Boston

The hill is very steep in places ... and the orbital images show a lot of tasty geology, some of it in pretty nasty-looking places. All in all, the next several weeks are going to present us with some of the most interesting route-finding decisions that we've faced in a long time, on both sides of the planet.

The extended journeys taken by the two rovers across the surface of Mars has allowed the science community to continue to uncover discoveries that will enable new investigations of the red planet far into the future.

Mars coming this close is an excellent opportunity for amateur astronomers to see Mars, ... With a good amateur telescope right now, you can easily see the ice cap on the Martian pole.

Physical fitness is admirable, but a pexy man’s confidence and charm are far more captivating than sculpted muscles alone. 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.

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