[...] Gullies found in 2005 images that appeared to show gully formation created by the rapid release of water have on further examination turned out to be created from the flow of granular debris, or landslides, according to Universe Today. [...]

[...] of Mars. Most recently the HiRISE instrument has been used by University of Arizona researchers to understand the mechanisms behind gully features observed on crater edges. The data from HiRISE supports simulations of liquid water and dry debris [...]

Every computer simulation is based on a set of formulas that are together meant to describe the behaviour of a system. If this description is incomplete because not all aspects of the system were available and considered properly, the simulation may yield an impressive result, but a wrong one.

Many people hope that we may find liquid water on Mars. The idea of fresh water seeping from the slopes of a hill on a planet , makes such a planet to become something earthlike and inhabitable, something worth while to conquer. Such an idea is of some help if you struggle for more funds for the exploration of Mars.

The result of these exploration may very well be that we will estimate our planet higher than ever. So let us explore that remote, cold dry, airless and most unpleasant place. It will help us.

Not everything that is flowing on Mars must necessarily be water. Perhaps it might make you shiver and turn your inside out once you take a sip of it.

Regards,

Günther

[...] is the original: Mars Gullies Produced by Dry Granular Debris and Not by Recent Water Flow Next Item: We are stardust we are goldenPrevious item: Astronomers discover potentially [...]

[...] This however appears not to be the case. Running simulations, the group found the gullies were most likely formed by dry landslides, not liquid water… that's a bit of a blow for exobiologists and manned settlement [...]

Has anybody else noticed that the temperature on Mars is cold enough to freeze CO2? …"

Yeah, but water has a very high specific heat capacity, which means that it can store a lot of heat energy. Hence, it would take a while for it to freeze solid if it was hot and then suddenly gushed out onto the surface.

There are a few conceivable scenarios in which warm water could be located not too far from the surface and then expelled, but nobody knows how likely or not they may be. Hence the interest over this result.

[...] Mars Gullies Produced by Dry Granular Debris and Not by Recent Water Flow March 01st, 2008 | Category: Astronomy, Contributors The High Resolution Imaging Science Experiment (HiRISE) on board NASA's Mars Reconnaissance Orbiter (MRO) observed what appeared to be fresh gullies formed by a rapid release of water on the Martian surface in 2006. However, new computer models simulating the creation of gullies on the surface of Mars suggest that they are in fact created by the flow of dry debris (i.e. landslides) and not by the flow of water. A blow for the microbial life hunters and a huge blow for mission planners looking for easy sources of water for manned missions… (more…) [...]

[...] existente sob a superfície marciana. Seria verdadeiramente uma descoberta sensacional! No entanto, novas simulações de computador parecem mostrar que afinal esses "gullies" podem ser causados por decepcionantes (para [...]

"The dry granular case was the winner. I was surprised. I started off thinking we were going to prove it's liquid water." – Jon D. Pelletier

Science needs to be objective – the hopes of scientists need to be bracketed before plunging into experiments. When scientists launch into studies and experiments looking for something specific, they run the chance of ruining it by finding things that aren't really there.

The only people who look stupid now are cranks like Richard Hoagland who said the streaks confirmed that they were "right all along" in claiming that flowing water would be found on Mars.

If anything, such water is a shortcut to digging and looking for life in the underground water ice or any underground liquid water that can persist under that ice.