Though the Mars Lander Insight has shut down due to power reduction (dust on the solar panels), it learned a lot and there's more to be learned
Here's one of the factual truths it discovered:
"The spacecraft measured the thickness of all of Mars’s layers by bouncing seismic waves into the interior and analyzing their reflection. The planet’s crust, InSight found, is thinner than scientists believed it would be—just 25 to 40 km (15 to 25 mi.) deep. Its molten core, on the other hand, is surprisingly large—about 3,600 km (2,240 mi.) in diameter—for a planet that measures only 6,779 km (4,212 mi.) across."
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