Mars rocket designs favor tried and true CNN

Aerospace giants are already prepared to compete for lucrative contracts in NASA’s next big step toward the moon and Mars but they aren’t eager to start from scratch on a new rocket to take it there. Rather than a crash program to produce a new super-rocket, like the Saturn 5 moon rocket in the 1960s, this new initiative — which NASA is a year or more away from detailing — is more likely to use existing technology from space shuttles and expendable rockets.