Mars Exploration News  
Martian Poles In The Swiss Alps

The alpine village of Davos, seen from Weissfluhjoch. Image Credit: Leslie Mullen.
by Leslie Mullen
Moffett Field CA (SPX) Oct 27, 2006
The Fourth International Conference on Mars Polar Science and Exploration was recently held in Davos, Switzerland. It was an appropriate meeting place for those who study cold regions, because as Walter Ammann of the Swiss Federal Institute for Snow and Avalanche Research noted, "We like to joke that in Davos, we have 9 months of winter, and 3 months of cold."

Snow had not yet accumulated on the Alps that tower over the small village, but the proximity to nearby mountains and glaciers provided inspiration to the over one hundred scientists who met to discuss recent findings about the martian poles.

One conclusion generally shared during this meeting is that what we learn about the poles can teach us about the history of the entire planet. Steve Clifford of the Lunar and Planetary Institute was one of the conference organizers, and his words from the polar conference three years ago are more resonant today than ever: "All Mars science is polar science."

The first half of the meeting focused on the complexity and history of the polar regions. The south pole's many ice layers were analyzed in great detail. Because of their complexity, instead of calling the region a "polar cap" many of the scientists preferred to call it the "polar layered deposits," or PLD. Rather than just draping over the landscape, these white layers may be somehow independent of the underlying topography.

Jeff Plaut, a co-Principal Investigator on the European Space Agency's Mars Express MARSIS radar instrument, presented a nearly complete radar map of the south polar region, and helped the scientists come to a better understanding of how the south pole is structured.

"With martian missions as frequent as they've been, we've been able to benefit from the fact that there's always a great deal of new data to talk about," Clifford said. "With the first meeting in Houston in 1998, we were just beginning to get some of the early Mars Global Surveyor results. We'd had an opportunity to analyze many of those results by the time of the Iceland meeting in 2000, but there was also the absolute depression of having just lost the Mars Polar Lander -- that was agonizing. But then by the time of Lake Louise in 2003, we had the Mars Odyssey results that suggested there was water ice in the near surface. And now with this meeting, we're finally able to talk about the radar results for Mars. That's something we've been anticipating since the first meeting -- to be able to trace layers within the interior of the cap, and not just see what's exposed on the scarps and the troughs. Hopefully we'll have the same kind of coverage by the next meeting for the north polar cap, and with higher resolution with the Mars Reconnaissance Orbiter's SHARAD experiment."

The north pole is quite different than the south, but it is equally complex. There may be between 17 to 25 major layers in the north pole, and a newly-released image by the Mars Reconnaissance Orbiter showed some of these layers -- bands of light and dark that looked reminiscent of the rings of Saturn.

The amount of dust in the atmosphere may play an important role in the formation of the polar layers, making them almost like tree rings, where each layer will tell a different story about the environment in which it formed.

Learning the history of the poles goes to the heart of understanding not only how they came to be, but how they have played a role in shaping the rest of the planet. Mars's geologic and climatic history seems to be intimately tied into the obliquity, or tilt, of the planet as it orbits the sun. Unlike Earth, Mars has not enjoyed a stable tilt over the eons -- it alters in approximately one hundred thousand-year cycles. The orbit of Mars around the sun also changes over time. These two "astronomical" factors have likely resulted in the polar ice being transferred around the planet as it swings around the sun at different angles and distances. Many of the recent photos of Mars showing evidence of water flow on the surface may be the result of this change in obliquity and orbit, and the subsequent migration of the ice.

The second half of the meeting focused on current and future Mars polar missions. The Mars Reconnaissance Orbiter is now sending back intensely detailed photos of the polar regions, as well as other types of data, and this will be important information to have at hand when selecting a landing site for the Phoenix Lander, which is due to be launched in 2007. In fact, one of the first MRO images transmitted was of the potential Phoenix landing site in the high northern latitudes. One question brought up by this image was how did the rocks strewn about the surface get there? Are they meteorites? Were they deposited by past glacial movement? Or did some other unknown process put them there?

If it successfully lands, Phoenix will verify the findings of Mars Odyssey, which discovered substantial amounts of hydrogen in the surface (interpreted to be water ice, H2O). Phoenix will study the history of the northern permafrost, and see if the soil has ever been altered by the ice melting into liquid. Phoenix also will study the polar climate, and determine the habitability of the icy soil. As Peter Smith, Principal Investigator for Phoenix Lander noted, one-third of all soil carbon on Earth is locked up in the northern permafrost. Therefore the northern region of Mars is considered a great place to look for organics.

Although the Mars mission for 2011 has not yet been selected, there is much hope among polar scientists that the mission will include a drill to investigate deep into the ice. A thermal drill is being developed by the Jet Propulsion Laboratory with 2011 in mind, and Michael Hecht described this project -- called CHRONOS -- in some detail, explaining the mission goals and the difficulties they've encountered so far.

By the end of the conference, the tops of the Alps were dusted with new-fallen snow, and Davos was well on its way to becoming a winter wonderland for skiers. While skiing on Mars is not yet a possibility for even our robotic explorers, the onset of the ski season provides Mars polar scientists with a reminder of the changeability of the martian poles -- what was at one time barren rock then becomes covered with ice, and then changes back again. While martian seasons may not be as regular as Earth's, the Mars Polar Science conference showed that we may be getting much closer to understanding them.

Community
Email This Article
Comment On This Article

Related Links
Mars News and Information at MarsDaily.com
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


1000 Sols On Mars
Pasadena (JPL) Oct 26, 2006
NASA's long-lived Mars Exploration Rover Spirit will finish its 1,000th Martian day Thursday, continuing a successful mission originally planned for 90 Martian days. A color 360-degree panorama released today -- produced from the most detailed imaging yet completed by either Spirit or its twin, Opportunity -- shows rugged terrain of the robot's current location amid a range of hills. Spirit has been examining the surroundings for several months while perched with a tilt to the north for maximum solar energy during winter in Mars' southern hemisphere.









  • Could NASA Get To Pluto Faster? Space Expert Says Yes - By Thinking Nuclear
  • NASA plans to send new robot to Jupiter
  • Los Alamos Hopes To Lead New Era Of Nuclear Space Tranportion With Jovian Mission
  • Boeing Selects Leader for Nuclear Space Systems Program

  • No Lunar Polar Ice Sheets Found In High Resolution Radar Images
  • Ice Store At Moon's South Pole Is A Myth
  • New Russian Spaceship Will Be Able To Fly To Moon - Space Corp
  • In Space Everyone Can Hear You Misspeak

  • ISRO Moots Manned Mission To Space
  • The Spark Of A New Era
  • Space Radiation Threats To Astronauts Addressed In Federal Research Study
  • Retrofuture Products Launches Space Food Sticks

  • Scientist Who Found Tenth Planet Discusses The Downgrading Of Pluto
  • New Horizons Spacecraft Snaps Approach Image of the Giant Planet
  • Does The Atmosphere Of Pluto Go Through The Fast-Freeze
  • Changing Seasons On The Road Trip To Planet Nine

  • Jovian Junior Red Spot Growing Stronger
  • Exploring Europa By Way Of The Arctic
  • Junior Spot Zips Past Great Red Spot On Jupiter
  • Gemini Captures Close Encounter Of Two Jupiter Red Spots

  • Complex Meteorology At Venus
  • Flying Over The Cloudy World
  • Venus Express Spies Double Vortex
  • Venus Express Commissioning Phase Completed

  • Astronomer Describes An Eerily Beautiful Sight As Cassini Spys Faint New Rings
  • Saturn's Rings Show Evidence Of A Modern-Day Collision
  • Cassini Finds More Rings Highlighted By Telltale Small Particles
  • Chinese Lantern Technique Helps Track Clouds At Saturn

  • Alcatel Will Develop And Supply The Radio Frequency Subsystem For Prisma Satellites
  • SAIC Awarded Contract to Assist the Air Force with Satellite System Risk Reduction Program
  • Alcatel Alenia Space To Provide On-Board And Ground Segment Equipment For The LISA Pathfinder
  • Herschel-SPIRE Testing at ESTEC

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights 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