Mars mission got lucky: NASA lander touched down in a sand-filled crater, easing study of planet’s interior
http://www.sciencemag.org/news/2018/11/mars-mission-got-lucky-nasa-lander-touched-down-sand-filled-crater-easing-study-planets
Pictures from InSight show the lander sits within a flat, sand-filled crater.
PASADENA, CALIFORNIA—In a laboratory on Earth, the marsforming had already begun.