rocket+to+mars+Is

=Rocket to Mars=

The Mars Exploration Rover mission (MER) renews a NASA tradition of launching twin vehicles to the Red Planet. The tradition began in 1964 with Mariner 3 and 4, and continued with Mariner 6 and 7, Mariner 8 and 9, and Viking 1 and 2. Now, more than 25 years later, America is again sending twin spacecraft to the surface of Mars. NASA has returned to this strategy to double the mission’s science return and, at the same time, increase the odds of mission success.