NASA Will Land InSight on Mars With Cunning—and Lots of Cork

There's really no way to rehearse landing on Mars. You can simulate it, sure, but the most valuable lessons are learned during actual attempts. When things go poorly, those lessons are also the most expensive. The fact is, most missions to Mars don't make it, though NASA has a better track record than most. The agency has executed seven successful touchdowns on the red planet.

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