Where Science and Faith Converge
TNRTB

Did Mars Ever Have Liquid Water?

By Jeff Zweerink - January 21, 2016
More

In recent years, the question of Mars has shifted from whether it hosts advanced life (an idea shown to be futile) to whether it hosts water. Throughout the late 1800s, scientists such as William Whewell and Percival Lowell used observations with the best telescopes to argue that the Red Planet harbors a vast system of land and seas, as well as canals and intelligent life-forms that built them. Of course, skeptics like Edward Maunder and E. M. Antoniadi ultimately laid the scientific groundwork that dismantled the idea that Mars was inhabited by intelligent life. Now the conversation focuses more on the existence of water on Mars—and what that possibility could mean for humans, and Christians especially, on Earth.

A History of Hope for Water on Mars

A paper, published in 2000, hailed the discovery of recently formed gullies on Mars.1The study caused a lot of excitement because it proposed that flowing liquid water formed the gullies. The terrain surrounding the gullies also gave strong evidence that they were recent formations (somewhere between one day and a couple million years ago). One scientist even commented that this discovery was "the smoking gun that says there's liquid water and Mars has all the requirements for life." Others expressed more reservations, thinking that some alternative process formed the gullies without help from liquid water. Research carried out since the discovery of the gullies seems to favor those alternative models.

Though the Martian gullies appeared similar to those on Earth (which usually areformed by liquid water), detailed studies ultimately showed that gullies on Mars do not mean that liquid water ever existed there. Further investigations revealed that the Martian gullies formed under conditions far too cold for liquid water to exist. Instead, thin layers of dry ice (frozen carbon dioxide) often blanket the regions where gullies form. A recently published paper shows that dry ice will fill pores below the ice layer. During seasons of warming or lower pressure, the dry ice will sublimate, causing the rocky surface layer on Mars to become unstable. In areas with steep inclines, the destabilized surface will give way, creating the gullies seen in satellite images.2

However, other observations provide more conclusive evidence for liquid water in Mars' past. As one example, over the past decade rovers and satellites have detected concentrated silica (SiO2) deposits in soils and bedrock,3 valley floors and plains,4 and in volcanic craters.5 (And scientists are still finding silica deposits with concentrations greater than 90 percent!) While numerous mechanical processes can form gullies, only a few options exist for the chemical processes required to form highly pure silica deposits and all of the best candidates include liquid water.

Realizing that Water Does Not Equal Habitability

As astronomers catalog more and more exoplanets, the search for evidence of water on Mars highlights a couple apologetics points to keep in mind. We should not be surprised that some (or even many) exoplanets seem to share Earth's large-scale features (size, density, distance from star, etc.), including the presence of liquid water. After all, water is one of the most abundant molecules in the universe. However, we should also be cautious about assuming that such similarities mean that an exoplanet also matches Earth's capacity to support life. As our investigations continue to show, the environment on Mars poses hostility to life—even though the Red Planet shares many physical features in common with Earth.

Endnotes
  1. Michael C. Malin and Kenneth S. Edgett, "Evidence for Recent Groundwater Seepage and Surface Runoff on Mars," Science 288 (June 2000): 2330–35.
  2. C. Pilorget and F. Forget, "Formation of Gullies on Mars by Debris Flows Triggered by CO2Sublimation," Nature Geoscience 9 (January 2016): 65–69.
  3. S. W. Squyres et al., "Detection of Silica-rich Deposits on Mars," Science 320 (May 2008): 1063–67.
  4. R. E. Milliken et al., "Opaline Silica in Young Deposits on Mars," Geology 36 (November 2008): 847–50.
  5. J. R. Skok et al., "Silica Deposits in the Nili Patera Caldera on the Syrtis Major Volcanic Complex on Mars," Nature Geoscience 3 (December 2010): 838–41.

Category
  • Mars
Tags
  • Blogs

About Reasons to Believe

RTB's mission is to spread the Christian Gospel by demonstrating that sound reason and scientific research—including the very latest discoveries—consistently support, rather than erode, confidence in the truth of the Bible and faith in the personal, transcendent God revealed in both Scripture and nature. Learn More »

Support Reasons to Believe

Your support helps more people find Christ through sharing how the latest scientific discoveries affirm our faith in the God of the Bible.

Donate Now

U.S. Mailing Address
818 S. Oak Park Rd.
Covina, CA 91724
  • P (855) 732-7667
  • P (626) 335-1480
  • Fax (626) 852-0178
Reasons to Believe logo

Reasons to Believe is a nonprofit organization designated as tax-exempt under Section 501(c)3 by the Internal Revenue Service. Donations are tax-deductible to the full extent of the law. Our tax ID is #33-0168048. All Transactions on our Web site are safe and secure.

Copyright 2020. Reasons to Believe. All rights reserved. Use of this website constitutes acceptance of our Privacy Policy.