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This not-to-scale artist's concept depicts a cutaway view of Mars' interior, revealing the crust, mantle, and core. Debris from ancient impacts lies scattered in the mantle in the form of lumps that are as large as 2.5 miles (4 kilometers) across, data from NASA's InSight Mars lander shows. On the Martian surface at left, a meteoroid impact sends seismic signals (shown as curving concentric lines) through the planet; InSight is depicted at right. InSight placed the first seismometer on Mars' surface in 2018. The extremely sensitive instrument recorded 1,319 marsquakes before the lander ran ou…
