The annotated area of Mars in this illustration holds near-surface water ice that would be easily accessible for astronauts to dig up. The water ice was identified as part of a map using data from NASA orbiters. Credit: NASA/JPL-Caltech
NASA has big plans for returning astronauts to the Moon in 2024, a stepping stone on the path to sending humans to Mars. But where should the first people on the Red Planet land?
A new paper published in Geophysical Research Letters will help by providing a map of water ice believed to be as little as an inch (2.5 centimeters) below the surface.
Water ice will be a key consideration for any potential landing site. With little room to spare aboard a spacecraft, any human missions to Mars will have to harvest whats already available for drinking water and making rocket fuel.
NASA calls this concept in situ resource utilization, and its an important factor in selecting human landing sites on Mars. Satellites orbiting Mars are essential in helping scientists determine the best places for building the first Martian research station. The authors of the new paper make use of data from two of those spacecraft, NASAs Mars Reconnaissance Orbiter (MRO) and Mars Odyssey orbiter, to locate water ice that could potentially be within reach of astronauts on the Red Planet.
You wouldnt need a backhoe to dig up this ice. You could use a shovel, said the papers lead author, Sylvain Piqueux of NASAs Jet Propulsion Laboratory in Pasadena, California. Were continuing to collect data on buried ice on Mars, zeroing in on the best places for astronauts to land.
Liquid water cant last in the thin air of Mars; with so little air pressure, it evaporates from a solid to a gas when exposed to the atmosphere.
Martian water ice is locked away underground throughout the planets mid-latitudes. These regions near the poles have been studied by NASAs Phoenix lander, which scraped up ice, and MRO, which has taken many images from space of meteor impacts that have excavated this ice. To find ice that astronauts could easily dig up, the studys authors relied on two heat-sensitive instruments: MROs Mars Climate Sounder and the Thermal Emission Imaging System (THEMIS) camera on Mars Odyssey.
This rainbow-colored map shows underground water ice on Mars. Cool colors are closer to the surface than warm colors; black zones indicate areas where a spacecraft would sink into fine dust; the outlined box represents the ideal region to send astronauts for them to dig up water ice. Credit: NASA/JPL-Caltech/ASU
Why use heat-sensitive instruments when looking for ice? Buried water ice changes the temperature of the Martian surface. The studys authors cross-referenced temperatures suggestive of ice with other data, such as reservoirs of ice detected by radar or seen after meteor impacts. Data from Odysseys Gamma Ray Spectrometer, which is tailor-made for mapping water ice deposits, were also useful.
As expected, all these data suggest a trove of water ice throughout the Martian poles and mid-latitudes. But the map reveals particularly shallow deposits that future mission planners may want to study further.
While there are lots of places on Mars scientists would like to visit, few would make practical landing sites for astronauts. Most scientists have homed in on the northern and southern mid-latitudes, which have more plentiful sunlight and warmer temperatures than the poles. But theres a heavy preference for landing in the northern hemisphere, which is generally lower in elevation and provides more atmosphere to slow a landing spacecraft.
A large portion of a region called Arcadia Planitia is the most tempting target in the northern hemisphere. The map shows lots of blue and purple in this region, representing water ice less than one foot (30 centimeters) below the surface; warm colors are over two feet (60 centimeters) deep. Sprawling black zones on the map represent areas where a landing spacecraft would sink into fine dust.
Piqueux is planning a comprehensive campaign to continue studying buried ice across different seasons, watching how the abundance of this resource changes over time.
The more we look for near-surface ice, the more we find, said MRO Deputy Project Scientist Leslie Tamppari of JPL. Observing Mars with multiple spacecraft over the course of years continues to provide us with new ways of discovering this ice.
Reference: Widespread Shallow Water Ice on Mars at High and Mid Latitudes by Sylvain Piqueux, Jennifer Buz, Christopher S. Edwards, Joshua L. Bandfield, Armin Kleinbhl, David M. Kass and Paul O. Hayne, 10 December 2019, Geophysical Research Letters.DOI: 10.1029/2019GL083947
JPL manages the MRO and Mars Odyssey missions for NASAs Science Mission Directorate in Washington. Lockheed Martin Space in Denver built both orbiters. JPL built and operates the Mars Climate Sounder instrument. THEMIS was built and is operated by Arizona State University in Tempe. The Gamma Ray Spectrometer was built and is operated by the University of Arizona in Tucson.
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