Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

NASA images, White Sands features support a wetter Mars

11.12.2006
NASA’s announcement yesterday of evidence that water still flows on Mars, at least in brief spurts, demonstrates that the view of Mars as a very dry planet should be reevaluated, says Dawn Sumner, professor of geology at UC Davis. Recent work from by Sumner and graduate student Greg Chavdarian also supports the presence of liquid water near the surface.

Chavdarian and Sumner have studied cracks and fins in the sulfate-rich sands at White Sands National Monument in New Mexico. These features look remarkably similar to features seen by the Opportunity Mars Rover. Working at White Sands and in the lab, Chavdarian found that these features only form in sulfate sand when it is damp. The work was published earlier this year in the journal Geology.

The presence of flowing liquid water at the surface demonstrates that Mars has an active hydrologic cycle that includes significant water exchange between the subsurface and the surface, Sumner said.

“Even though liquid water is only transiently at the surface, it probably provided some water vapor to the atmosphere through evaporation and may have produced hydrous salts in surface sediments. Such hydrous sulfate salts have been inferred to be present at both MER rover sites, with the sedimentary rocks observed by Opportunity at Meridiani Planum containing more than 50% sulfates. Graduate student Greg Chavdarian and I proposed that some of the fracturing in rocks observed by Opportunity might be due to water cycling between these hydrous minerals and the atmosphere based on similar features in sulfate dunes at White Sands,” she said.

Sumner and Chavdarian have been testing their hypothesis by monitoring water cycling in the dunes at White Sands, but it has been difficult to extend their observations to match Martian conditions because of the view that the planet is so dry. But this new work suggests that a much wetter view of the planet will emerge, Sumner said.

The presence of flowing water on the surface of Mars raises many exciting possibilities for looking for life on Mars, Sumner said.

“Life does not persist in the absence of liquid water, so many astrobiologists interested in evaluating whether or not life ever existed on Mars have focused on looking for evidence of life in ancient rocks (fossil life) or have worked towards being able to drill into the subsurface of Mars to depths where liquid water may be present. Before today, we have had scant evidence that liquid water was present at depth. Now we do. And not only do we know that liquid water exists, we know that it flows to the surface, at least locally.

“The transient presence of liquid water at the surface suggests that we may not have to go into the subsurface to look for life; evidence of life or life itself might be carried to the surface by this flowing water. The water evaporates or infiltrates rapidly enough that life is unlikely to persist on the surface, but these gullies provide us with a signal from an environment within the planet that is more likely to host life than the surface.

“The presence of liquid water does not mean that life exists on Mars, but liquid water is essential for life,” Sumner said.

Andy Fell | EurekAlert!
Further information:
http://www.ucdavis.edu

More articles from Physics and Astronomy:

nachricht From the cosmos to fusion plasmas, PPPL presents findings at global APS gathering
13.11.2018 | DOE/Princeton Plasma Physics Laboratory

nachricht A two-atom quantum duet
12.11.2018 | Institute for Basic Science

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

Im Focus: Coping with errors in the quantum age

Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly

The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Epoxy compound gets a graphene bump

14.11.2018 | Materials Sciences

Microgel powder fights infection and helps wounds heal

14.11.2018 | Health and Medicine

How algae and carbon fibers could sustainably reduce the athmospheric carbon dioxide concentration

14.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>