The hope is that, somehow, InSight detects a marsquake. The last seismometers on Mars did not function according to plan during the twin NASA Viking missions that touched down 1976. One lander’s seismometer broke upon landing, while the other was stuck on its lander high enough that the wind kept rattling it. Scientists learned about wind dynamics on the Red Planet, which is an interesting field in itself — but nothing about marsquakes.
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The existence of a marsquake implies that the planet is active. An active planet has a much better chance of life because life thrives off of a dynamic environment. Marsquakes also show the interior of the planet, because the arrival times of different types of seismic waves will help scientists learn about the composition of the core, mantle, and crust.
But even if no marsquakes emerge, JPL’s Lori Glaze said that InSight will still provide valuable information about the interior of Mars.
“We do have other instruments,” noted Glaze, the acting director of NASA’s planetary science division. “We’re certainly going to learn about the heat flow out of the mantle, and we’re still able to measure the size of the core,” she added. The core measurements will be done through a radio science experiment. Antennas on Earth will pick up InSight’s faint signal to see how much the planet underneath wobbles in its orbit. These wobbles will yield the size of the core.
This work is important for understanding how planets and rocky worlds are formed. While we have plenty of data on the Earth, and a few seismic measurements on the moon, we don’t have a lot of information about worlds that lie in between these sizes. So Mars is the perfect spot. It’s relatively close to Earth, and its environment is benign enough to support science on the surface (unlike, say, the hellhole Venus, with its oven-like temperatures and crushing atmospheric pressures.)
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InSight’s landing site is Elysium Planitia, a quiet zone that will be very flat and, investigators hope, not too rocky to set down the seismometer. Landing on Mars will be tricky, and NASA is hoping to keep up its successful streak of Mars missions that has lasted since 2001.
Even after InSight’s scheduled landing, both NASA and Europe have ambitious Mars missions planned in the 2020s. Each agency will send a rover to Mars to search for signs of habitability, building on the past work of the Spirit, Opportunity, and Curiosity missions. NASA’s Mars 2020 rover will even store the most promising samples for an eventual sample-return mission to Earth.