Bright Chunks At Phoenix Lander's Mars Site Must Have Been Ice
Photo credit: NASA/JPL-Caltech/University of Arizona/Max Planck Institute -->June 19, 2008 -- Dice-size crumbs of bright material have vanished from inside a trench where they were photographed by NASA's Phoenix Mars Lander four days ago, convincing scientists that the material was frozen water that vaporized after digging exposed it.
"It must be ice," said Phoenix Principal Investigator Peter Smith of the University of Arizona, Tucson. "These little clumps completely disappearing over the course of a few days, that is perfect evidence that it's ice. There had been some question whether the bright material was salt. Salt can't do that." The chunks were left at the bottom of a trench informally called "Dodo-Goldilocks" when Phoenix's Robotic Arm enlarged that trench on June 15, during the 20th Martian day, or sol, since landing. Several were gone when Phoenix looked at the trench early today, on Sol 24.
Also early today, digging in a different trench, the Robotic Arm connected with a hard surface that has scientists excited about the prospect of next uncovering an icy layer. The Phoenix science team spent Thursday analyzing new images and data successfully returned from the lander earlier in the day. Studying the initial findings from the new "Snow White 2" trench, located to the right of "Snow White 1," Ray Arvidson of Washington University in St. Louis, co-investigator for the robotic arm, said, "We have dug a trench and uncovered a hard layer at the same depth as the ice layer in our other trench." On Sol 24, Phoenix extended the first trench in the middle of a polygon at the "Wonderland" site.
While digging, the Robotic Arm came upon a firm layer, and after three attempts to dig further, the arm went into a holding position. Such an action is expected when the Robotic Arm comes upon a hard surface. Meanwhile, the spacecraft team at Lockheed Martin Space Systems in Denver is preparing a software patch to send to Phoenix in a few days so scientific data can again be saved onboard overnight when needed.
Because of a large amount a duplicative file-maintenance data generated by the spacecraft Tuesday, the team is taking the precaution of not storing science data in Phoenix's flash memory, and instead downlinking it at the end of every day, until the conditions that produced those duplicative data files are corrected.
"We now understand what happened, and we can fix it with a software patch," said Phoenix Project Manager Barry Goldstein of NASA's Jet Propulsion Laboratory, Pasadena. "Our three-month schedule has 30 days of margin for contingencies like this, and we have used only one contingency day out of 24 sols. The mission is well ahead of schedule. We are making excellent progress toward full mission success."
Sunday, June 1, 2008
Saturday, May 31, 2008
Address to U.S. Astronauts
Tuesday, September 21, 1965
The Lion of Judah has prevailed.
Haile Selassie I, Elect of GodKing of Kings of Ethiopia
We wish to express our sincere thanks for the message that has been sent by His Excellency President Johnson. We thank you also for the kind words you have said about our country. We are happy to receive you for many reasons: happy because human knowledge, at the present time, is being extended with the hope that mankind would benefit. We are confident and sure that the world realizes today that as a result of the investigations and as a result of the courage you have shown, all humanity is going to benefit. Of course, it is one thing for us to be sitting at home and to follow events that are transpiring outside, while with extreme personal courage and at great personal risk, on behalf of humanity, you were undertaking a feat that has given you personal satisfaction and brought great honour to the country that you represent. As we said, your undertaking for advancement of science and on behalf of human good can only result in great benefit to humanity in general. It is through men that have dedicated themselves to scientific efforts that the human being has made so much progress. And it is because men like you have shown extreme personal courage for the future good of mankind that mankind has accomplished so much in scientific investigations. There is no doubt that through these scientific achievements mankind can advance. We are sure the pleasure accruing from what you have accomplished is not solely confined to ourselves. The pleasure must naturally go to the people of your country and to us, too. The result of your adventurous experiments and works is an admirable contribution from the point of view of all men who are interested in the advancement and progress of human society. Your space flight and subsequent flights that are to be undertaken by men like you give us confidence in the bright future of mankind. We thank you very much for the presents, and please convey our heartfelt congratulations to President Johnson and all those people who are responsible for this. Again we would like to take particular note of your heroism and dedication to the cause of science.