NASA’s InSight lander is busy recording the fits and spasms of the world beneath its feet—even as it approaches the end of its life
“We’ve been able to illuminate the interior structure of Mars for the first time, instead of having a fuzzy picture that is informed by analogy to the Earth, or the moon,” Banerdt says. “Mars is now a solidly understood planet. It’s not like we knowMeasuring impact
Garcia and his colleagues identified the impacts based on telltale acoustic waves produced as meteors explode in the atmosphere as they streak toward a planet’s surface. On Mars, and at night, these sonic signals can travel for hundreds of miles through the bottom layer of chilled Martian atmosphere. By combining information from the acoustic waves and the impact-generated seismic waves, scientists can determine the meteor’s trajectory and eventual crash site.
The fresh craters are between 13 and 25 feet across, the work of objects so small they would likely burn up in Earth’s thicker, more protective atmosphere. By definitively linking a seismic signal with a resulting crater on another world, scientists can study the energetics of the collisions.
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