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"While the Mars Curiosity rover has garnered most of our space-gazing attention lately, another of NASA's spacecraft has made quite a momentous discovery on an entirely different planet. The Messenger space probe (which stands for MErcury Surface, Space ENvironment, GEochemistry and Ranging) has found new evidence for ice on Mercury, which is surprising given its proximity to the sun. Thanks to a subtly tilted axis, many of the planet's polar craters never see the light of day, and can dip to temperatures as low as minus 370 Fahrenheit. Indeed, scientists claim there's 100 billion to 1 trillion tons of ice on Mercury -- David Lawrence, a Messenger participating scientist, said that \"if spread over an area the size of Washington, D.C., [the ice] would be more than two miles thick.\" The Messenger, which only started orbiting Mercury last year, helped confirm scientists' conclusions by capturing detailed images of the planet's surface, measuring the craters' reflectivity and utilizing a neutron spectrometer that discovered the presence of excess hydrogen. Scientists even found slightly warmer regions on Mercury that might be temperate enough for, well, a colony: \"People joke about it, but it's not so crazy, really,\" said David A. Paige, a UCLA professor quoted in the New York Times. Of course, this is assuming we don't boil or freeze to death on our way there. For more information about the find, check out the press release below.Show full PR text      NASA SPACECRAFT FINDS NEW EVIDENCE FOR WATER ICE ON MERCURY     WASHINGTON -- A NASA spacecraft studying Mercury has provided   compelling support for the long-held hypothesis the planet harbors   abundant water ice and other frozen volatile materials within its   permanently shadowed polar craters.     The new information comes from NASA's MErcury Surface, Space   ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft. Its   onboard instruments have been studying Mercury in unprecedented   detail since its historic arrival there in March 2011. Scientists are   seeing clearly for the first time a chapter in the story of how the   inner planets, including Earth, acquired their water and some of the   chemical building blocks for life.     \"The new data indicate the water ice in Mercury's polar regions, if   spread over an area the size of Washington, D.C., would be more than   2 miles thick,\" said David Lawrence, a MESSENGER participating   scientist at the Johns Hopkins University Applied Physics Laboratory   (APL) in Laurel, Md., and lead author of one of three papers   describing the findings. The papers were published online in   Thursday's edition of Science Express.     Spacecraft instruments completed the first measurements of excess   hydrogen at Mercury's north pole, made the first measurements of the   reflectivity of Mercury's polar deposits at near-infrared   wavelengths, and enabled the first detailed models of the surface and   near-surface temperatures of Mercury's north polar regions.     Given its proximity to the sun, Mercury would seem to be an unlikely   place to find ice. However, the tilt of Mercury's rotational axis is   less than 1 degree, and as a result, there are pockets at the   planet's poles that never see sunlight.     Scientists suggested decades ago there might be water ice and other   frozen volatiles trapped at Mercury's poles. The idea received a   boost in 1991 when the Arecibo radio telescope in Puerto Rico   detected radar-bright patches at Mercury's poles. Many of these   patches corresponded to the locations of large impact craters mapped   by NASA's Mariner 10 spacecraft in the 1970s. However, because   Mariner saw less than 50 percent of the planet, planetary scientists   lacked a complete diagram of the poles to compare with the radar   images.     Images from the spacecraft taken in 2011 and earlier this year   confirmed all radar-bright features at Mercury's north and south   poles lie within shadowed regions on the planet's surface. These   findings are consistent with the water ice hypothesis.     The new observations from MESSENGER support the idea that ice is the   major constituent of Mercury's north polar deposits. These   measurements also reveal ice is exposed at the surface in the coldest   of those deposits, but buried beneath unusually dark material across   most of the deposits. In the areas where ice is buried, temperatures   at the surface are slightly too warm for ice to be stable.     MESSENGER's neutron spectrometer provides a measure of average   hydrogen concentrations within Mercury's radar-bright regions. Water   ice concentrations are derived from the hydrogen measurements.     \"We estimate from our neutron measurements the water ice lies beneath   a layer that has much less hydrogen. The surface layer is between 10   and 20 centimeters [4-8 inches] thick,\" Lawrence said.     Additional data from detailed topography maps compiled by the   spacecraft corroborate the radar results and neutron measurements of   Mercury's polar region. In a second paper by Gregory Neumann of   NASA's Goddard Flight Center in Greenbelt, Md., measurements of the   shadowed north polar regions reveal irregular dark and bright   deposits at near-infrared wavelength near Mercury's north pole.     \"Nobody had seen these dark regions on Mercury before, so they were   mysterious at first,\" Neumann said.     The spacecraft recorded dark patches with diminished reflectance,   consistent with the theory that ice in those areas is covered by a   thermally insulating layer. Neumann suggests impacts of comets or   volatile-rich asteroids could have provided both the dark and bright   deposits, a finding corroborated in a third paper led by David Paige   of the University of California at Los Angeles.     \"The dark material is likely a mix of complex organic compounds   delivered to Mercury by the impacts of comets and volatile-rich   asteroids, the same objects that likely delivered water to the   innermost planet,\" Paige said.     This dark insulating material is a new wrinkle to the story, according   to MESSENGER principal investigator Sean Solomon of Columbia   University's Lamont-Doherty Earth Observatory in Palisades, N.Y.     \"For more than 20 years, the jury has been deliberating whether the   planet closest to the sun hosts abundant water ice in its permanently   shadowed polar regions,\" Solomon said. \"MESSENGER now has supplied a   unanimous affirmative verdict.\"     MESSENGER was designed and built by APL. The lab manages and operates   the mission for NASA's Science Mission Directorate in Washington. The   mission is part of NASA's Discovery Program, managed for the   directorate by the agency's Marshall Space Flight Center in   Huntsville, Ala."^^<http://www.w3.org/2001/XMLSchema#string>
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