https://phys.org/news/2018-11-insight-mars.html

Here are a few things to know about InSight's landing.

Only about 40 percent of the missions ever sent to Mars—by any space agency—have been successful. The U.S. is the only nation whose missions have survived a Mars landing. The thin atmosphere—just 1 percent of Earth's—means that there's little friction to slow down a spacecraft. Despite that, NASA has had a long and successful track record at Mars. Since 1965, it has flown by, orbited, landed on and roved across the surface of the Red Planet.