There doesn't appear to be much water at all directly underneath InSight - by AndyTomaswick
They are filtered through the media directly below the lander, and different media would have different filtering properties. For example, dry material would react differently to vibrations than wet, claylike material. That difference is what the Scripps team used as the basis of their study.
Using data collected for other purposes, the researchers ran a series of 10,000 simulations using different types of material as a transfer medium for the signals that InSight detected. They found that the media that best fit the signals InSight was seeing were dry, porous rocks that contained hardly any water.
This came as a surprise, as many scientists had expected water, at least in its frozen form, to be ubiquitous even at the equatorial latitudes where InSight is located. Water is helpful for various things on Mars, the two main ones being human life support and the search for life. A dry, porous material is much less likely to have fossils or similar evidence of extinct life than a wet, claylike mixture.As such, this would seem like a setback for Martian explorers.
These ongoing discoveries, combined with using new data in unique ways that they weren’t originally intended, are precisely how science is supposed to work. So while sometimes both researchers and space enthusiasts alike won’t like the answers that the data points to, it’s better to face it head-on rather than going in blindly or, worse yet, willfully ignoring the truth.
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