How Did NASA Lose a Mars Space Probe Because of Maths?
The Mars Lander Crash: What Went Wrong?
What went wrong with ESA's Rosetta-Philae mission to comet 67P Churyumov–Gerasimenko?
A lander is a spacecraft which descends toward and comes to rest on the surface of an astronomical body. By contrast with an impact probe, which makes a hard landing and is damaged or destroyed so ceases to function after reaching the surface, a lander makes a soft landing after which the probe remains functional.