Mars Exploration News  
Tracing Martian Water

False-color image of gully channels in a crater in the southern highlands of Mars, captured with the HiRISE instrument on MRO. Credit: NASA/JPL/University of Arizona
by Staff Writers
Moffett Field CA (SPX) Sep 26, 2007
NASA's Mars Reconnaissance Orbiter (MRO) is examining several features on Mars that address the role of water at different times in Martian history. Liquid water is essential for life as we know it, and determining the history of water on Mars is vital in understanding whether or not the planet could have supported life in its past. Studying locations where water may have flowed and pooled on the martian surface will also help researchers choose the most interesting and scientifically important landing sites for future Mars missions.

Features examined with the orbiter's advanced instruments include material deposited in two gullies within the past eight years, polar ice layers formed in the recent geologic past, and signs of water released by large impacts when Mars was older.

Last year, discovery of the fresh gully deposits from before-and-after images taken since 1999 by another orbiter, Mars Global Surveyor, raised hopes that modern flows of liquid water had been detected on Mars. Observations by the newer orbiter, which reached Mars last year, suggest these deposits might instead have resulted from landslides of loose, dry materials. Researchers report this and other findings from the MRO in five papers in the journal Science. "The key question raised by these two deposits is whether water is coming to the surface of Mars today." said Alfred McEwen of the University of Arizona, Tucson, lead scientist for the spacecraft's High Resolution Imaging Science Experiment camera and co-author of three of the papers. "Our evidence suggests the new deposits did not necessarily involve water."

One of the fresh deposits is a stripe of relatively bright material several hundred yards long that was not present in 1999 but appeared by 2004. The orbiter's Compact Reconnaissance Imaging Spectrometer for Mars reveals the deposit is not frost, ice or a mineral left behind by evaporation of salty water. Also, the researchers inspected the slopes above this and five other locations that have bright and apparently young deposits. The slopes are steep enough for sand or loose, dry dust to flow down the gullies. Bright material seen uphill could be the source.

Other gullies, however, offer strong evidence of liquid water flowing on Mars within the last few million years, although perhaps at a different phase of repeating climate cycles. Mars, like Earth, has periodic changes in climate due to the cycles related to the planets' tilts and orbits. Some eras during the cycles are warmer than others. These gullies are on slopes too shallow for dry flows, and images from MRO's high-resolution camera show clear indicators of liquid flows, such as braided channels and terraces within the gullies. Another new finding from that camera may help undermine arguments that very ancient Mars had a wet climate on a sustained basis. Landscapes with branched channels and fan-like deposits typical of liquid flows were found around several impact craters. Images show close association between some of those flow features and ponded deposits interpreted as material melted by the impact of a meteoroid into ice-rich crust.

This new evidence supports a hypothesis that ancient water flows on the surface were episodic, linked to impact events and subsurface heating, and not necessarily the result of precipitation in a sustained warmer climate. Crater-digging impacts were larger and more numerous during the early Martian era when large drainage networks and other signs of surface water were carved on many parts of the planet.

The MRO has examined ice-rich layered deposits near the Martian poles with the ground-penetrating Shallow Subsurface Radar instrument, and other experiments. The radar detected layering patterns near the south pole that suggest climatic periods of accumulating deposits have alternated with periods of erosion, report Roberto Seu of the University of Rome and co-authors. Maria Zuber of the Massachusetts Institute of Technology, and collaborators used effects of Mars' gravity on the orbiter to check whether layered deposits at the south pole are high-density material, such as rock, or lower-density such as ice. Their observations add to other evidence that the layers are mostly water. Kenneth Herkenhoff of the U.S. Geological Survey, Flagstaff, and others used the high-resolution camera to trace a series of distinctive layers near the north pole.

An accompanying paper by Windy Jaeger of the U.S. Geological Survey, Flagstaff, and co-authors uses images from the high-resolution camera to show lava flows completely draping a young Martian channel network called Athabasca Valles This creates ponded lava over an expanse that other researchers had interpreted in 2005 as a frozen sea.

Richard Zurek, project scientist for MRO at NASA's Jet Propulsion Laboratory (JPL), Pasadena, Calif., said, "These latest increases in observational capabilities, individually and in combination, reveal a more complex Mars, a planet with a rich history that we are still learning to read."

Community
Email This Article
Comment On This Article

Related Links
Mars News and Information at MarsDaily.com
Lunar Dreams and more



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


Mars Gully: No Mineral Trace Of Liquid Water
Pasadena CA (SPX) Sep 25, 2007
This image of the Centauri-Hellas Montes region was taken by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) at 2107 UTC (4:07 p.m. EST) on Jan. 9, 2007, near 38.41 degrees south latitude, 96.81 degrees east longitude. CRISM's image was taken in 544 colors covering 0.36-3.92 micrometers, and shows features as small as 20 meters (66 feet) across. The region covered is slightly wider than 10 kilometers (6.2 miles) at its narrowest point.









  • Nuclear Power In Space - Part 2
  • Outside View: Nuclear future in space
  • Nuclear Power In Space
  • Could NASA Get To Pluto Faster? Space Expert Says Yes - By Thinking Nuclear

  • Asian spacefarers race for the moon
  • Outside View: China shoots for the moon
  • NASA Maps The Moon With Google
  • The Promised Moon

  • NASA, NSBRI Select 17 Proposals In Space Radiation Research
  • Space summit looks to the future from India
  • Part-time model is Malaysia's first astronaut
  • Russia aims for new far east space launch pad by 2020

  • Outbound To The Outerplanets At 7 AU
  • Charon: An Ice Machine In The Ultimate Deep Freeze
  • New Horizons Slips Into Electronic Slumber
  • Nap Before You Sleep For Your Cruise Into The Abyss Of Outer Sol

  • Jupiter: Friend Or Foe
  • Researchers Produce Images Of Gases Escaping From Io
  • Researchers Produce Images Of Gases Escaping From Jupiter Moon Io
  • Hubble Catches Jupiter Changing Its Stripes

  • 500 Days At Venus, And The Surprises Keep Coming
  • Up Up And Away To Venus
  • Spacecraft Tandem Provides New Views Of Venus
  • Venusian Rendezvous Results: Chapter One

  • Saturn's Third Moon Begins To Yield Its Secrets
  • Saturn's Moon Iapetus Is The Yin-And-Yang Of The Solar System
  • Cassini Prepares To Fly by Walnut-Shaped Moon
  • Fasten Your Seat Belts, Turbulence Ahead - Lessons From Titan

  • Radio Wave Cooling Offers New Twist On Laser Cooling
  • SSC Communication System Flys On Russian Capsule Foton
  • Engineers Rescue Aging Satellites And Save Millions
  • Russian Satellites: Smaller, Lighter, Cheaper

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2007 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement