Why the Perseverance rover's Mars landing was so complicated — and why so many others have failed
8:52
On Thursday, NASA's Perseverance rover stuck its landing on the surface of Mars, but many of the scientists involved in the mission were biting their nails through the process as past missions have frequently gone wrong. Canadian science and space writer Elizabeth Howell takes us through years of Mars misses and crash landings, and tells us why landing on the red planet is still such a complicated thing to try to do.