Mars'satmosphere is thin and its surface is bombarded with deadly radiation.
2
Little was known of Mars'satmosphere or surface conditions when Ruppe's engineers performed their study.
3
The Voyager landing capsule would enter Mars'satmosphere moving at between two and three miles per second.
4
Huge cloud-like plumes that were spotted by amateur astronomers stretching hundreds of kilometres into Mars'satmosphere have defied explanation - until now.
5
The lander might separate from the orbiter as it approached the planet and enter Mars'satmosphere directly with no stop in Mars orbit.