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Days on Mars are getting shorter

The spin of Mars is speeding up. NASA’s InSight lander fell silent in December after dust accumulated on its solar panels. But scientists continue to sift through the four years’ worth of data it gathered, learning more about what is deep inside the red planet. Most of what they have learned about Mars came from InSight’s sensitive seismometer, placed on the surface to measure the minuscule vibrations from small marsquakes and meteor impacts reverberating around and through the planet.