All coverage
On Mars, the Perseverance rover and a helicopter will roam free
By Rebecca Heilweil
Mars launch: NASA sends Perseverance rover to space
By Ashley Strickland
As it happened: Nasa rover launches on Mars life mission
By Jonathan Amos, Paul Rincon & Ritu Prasad
NASA's most ambitious Mars mission yet is on its way to the red planet
By Morgan McFall-Johnsen & Dave Mosher