Twenty-two planetary astronomers from research institutions in Italy who form part of the MARSIS (Mars Advanced Radar for Subsurface and Ionospheric Sounding) mission created an international stir when they announced the recent discovery of “subglacial liquid water” on Mars.1 Norwegian Polar Institute scientist Anja Diez concurrently published a Perspectives commentary in Science titled, “Liquid Water on Mars.2

Predictably, the popular press was much more sensational and exuberant. Fox News referred to the finding as a “liquid water lake” and called the discovery a “Mars shocker” and a “game changer” in the search for alien life.3 Yahoo News UK announced that the MARSIS team discovered a “huge lake …of liquid water” and wrote that the discovery has “major implications for the chances of life surviving in Martian conditions.”4

What MARSIS Found
The peer-reviewed paper published in Science accurately states what the 22 planetary astronomers found and what they did not find. The team’s discovery resulted from several years of data collection by the MARSIS instrument onboard the European Space Agency’s Mars Express orbiter spacecraft (see figure). MARSIS sends strong pulses of radio waves to the Martian surface and records the echoes of the reflected radio waves. Some of the waves bounce off the Martian surface, but others penetrate to depths of up to 3 kilometers (1.9 miles). The penetrating waves are able to sensitively detect sharp transitions in the subterranean Martian layers, such as a transition from a rock layer to an ice layer or an ice layer to a liquid water layer.

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Figure: Mars Express Orbiter Spacecraft with MARSIS Antenna Deployed
Image credit: NASA/JPL/Corby Waste

The 22 planetary astronomers saw in their analysis of the MARSIS data a small, very bright echo of the reflected radio waves under Mars’s south polar ice cap. It was offset by 9° from the Martian south pole. The brightness of the echo was higher than what would normally be reflected off ice, but consistent with the radar reflectivity of liquid water.

Further confirmation that the radar echo was reflected off liquid water came from the team’s estimate of the dielectric permittivity of the bright underground Martian feature. Dielectric permittivity refers to a reflecting layer’s ability to store energy in an electric field. Liquid water has a higher dielectric permittivity than either ice or rock. Determining the value of a layer’s dielectric permittivity requires knowledge of the radar signal power reflected off the layer. This radar signal power could only be estimated, not accurately measured, by the team. Nevertheless, their estimates were consistent with the reflecting layer being liquid water.

After reading the paper, I agree with the 22 planetary astronomers’ conclusion that they found strong, though not conclusive, evidence for a stable subterranean body of liquid water on Mars. As Jeffrey Plaut, a MARSIS principal investigator at the Jet Propulsion Laboratory who was not an author on the paper, stated in an interview, “I would say the interpretation is plausible, but it’s not quite a slam dunk yet.”5

The radar echoes did accurately establish the area, but not the depth, of the radar bright subterranean layer. The team reported “a well-defined, 20-kilometer-wide” body.6 The team was not able to determine the thickness of the layer, but lead author Roberto Orosei stated that it had to be more than just “a thin film.”7

Implications for Life
The team concluded that the likely liquid water layer was located right under a 1.5-kilometer-thickness of ice, which is the thickest part of the south polar ice cap. The pressure from 1.5 kilometers of ice raises the temperature of the likely liquid water layer to -68°Celsius (-90°Fahrenheit). For water to remain liquid at this very low temperature, the water must be saturated with perchlorate salts. This perchlorate saturation rules out any possibility of life surviving in the layer. As geophysicist David Stillman of Southwest Research Institute in Boulder, Colorado, stated in an interview, “If Martian life is like earth life, this is too cold and too salty.”8

The determination that the radar bright subterranean layer must be a saturated perchlorate brine led the team of 22 planetary astronomers to draw two different possible conclusions about the nature of the layer. They wrote, “The brine could be mixed with basal soils to form a sludge or could lie on top of the basal material to form localized brine pools.”9

The MARSIS discovery is not a big freshwater lake, as some internet reports implied. Nor is the discovered layer a possible habitat for life. However, if indeed the layer is saturated with perchlorate salts, it is highly probable that it is a site with at least a small quantity of stable liquid water. As our book Origins of Life10 explains in much detail, while liquid water is a requirement for life, it is very far from a guarantee of life.

Featured image credit: NASA/JPL/MSSS

Endnotes
  1. Roberto Orosei et al., “Radar Evidence of Subglacial Liquid Water on Mars,” Science, Reports, first release (July 25, 2018): 1–9, doi:10.1126/science.aar7268.
  2. Anja Diez, “Liquid Water on Mars,” Science, Perspectives, first release (July 25, 2018): 1–4, doi:10.1126/science.aau1829.
  3. Chris Ciaccia, “Mars Shocker: Liquid Water Lake Found on the Red Planet,” Fox News (July 25, 2018), http://www.foxnews.com/science/2018/07/25/mars-shocker-liquid-water-lake-found-on-red-planet.html.
  4. Matilda Long, “Scientists Discover Liquid Water on Mars for the First Time,” Yahoo News UK (July 25, 2018), https://www.yahoo.com/news/scientists-found-water-mars-fist-time-140732251.html.
  5. Daniel Clery, “Liquid Water Spied Deep Below Polar Ice Cap on Mars,” Science, first release (July 25, 2018), doi:10.1126/science.aau8871.
  6. Orosei et al., “Radar Evidence,” 1.
  7. Clery, “Liquid Water Spied Deep Below.”
  8. Clery, “Liquid Water Spied Deep Below.”
  9. Orosei et al., “Radar Evidence,” 3.
  10. Fazale Rana and Hugh Ross, Origins of Life: Biblical and Evolutionary Models Face Off (Covina, CA: RTB Press, 2014).

Check out more from Dr. Hugh Ross @Reasons.org

About The Author

Dr. Hugh Ross

Reasons to Believe emerged from my passion to research, develop, and proclaim the most powerful new reasons to believe in Christ as Creator, Lord, and Savior and to use those new reasons to reach people for Christ. I also am eager to equip Christians to engage, rather than withdraw from or attack, educated non-Christians. One of the approaches I’ve developed, with the help of my RTB colleagues, is a biblical creation model that is testable, falsifiable, and predictive. I enjoy constructively integrating all 66 books of the Bible with all the science disciplines as a way to discover and apply deeper truths. 1 Peter 3:15–16 sets my ministry goal, "Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, keeping a clear conscience." Hugh Ross launched his career at age seven when he went to the library to find out why stars are hot. Physics and astronomy captured his curiosity and never let go. At age seventeen he became the youngest person ever to serve as director of observations for Vancouver's Royal Astronomical Society. With the help of a provincial scholarship and a National Research Council (NRC) of Canada fellowship, he completed his undergraduate degree in physics (University of British Columbia) and graduate degrees in astronomy (University of Toronto). The NRC also sent him to the United States for postdoctoral studies. At Caltech he researched quasi-stellar objects, or "quasars," some of the most distant and ancient objects in the universe. Not all of Hugh's discoveries involved astrophysics. Prompted by curiosity, he studied the world’s religions and "holy books" and found only one book that proved scientifically and historically accurate: the Bible. Hugh started at religious "ground zero" and through scientific and historical reality-testing became convinced that the Bible is truly the Word of God! When he went on to describe for others his journey to faith in Jesus Christ, he was surprised to discover how many people believed or disbelieved without checking the evidence. Hugh's unshakable confidence that God's revelations in Scripture and nature do not, will not, and cannot contradict became his unique message. Wholeheartedly encouraged by family and friends, communicating that message as broadly and clearly as possible became his mission. Thus, in 1986, he founded science-faith think tank Reasons to Believe (RTB). He and his colleagues at RTB keep tabs on the frontiers of research to share with scientists and nonscientists alike the thrilling news of what's being discovered and how it connects with biblical theology. In this realm, he has written many books, including: The Fingerprint of God, The Creator and the Cosmos, Beyond the Cosmos, A Matter of Days, Creation as Science, Why the Universe Is the Way It Is, and More Than a Theory. Between writing books and articles, recording podcasts, and taking interviews, Hugh travels the world challenging students and faculty, churches and professional groups, to consider what they believe and why. He presents a persuasive case for Christianity without applying pressure. Because he treats people's questions and comments with respect, he is in great demand as a speaker and as a talk-radio and television guest. Having grown up amid the splendor of Canada's mountains, wildlife, and waterways, Hugh loves the outdoors. Hiking, trail running, and photography are among his favorite recreational pursuits - in addition to stargazing. Hugh lives in Southern California with his wife, Kathy, and two sons.



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