Musk using old tech: Russian firm shows reusable Mars rocket
Talking about SpaceX's planned Mars mission, Vladimir Koshlakov who heads Russia's Keldysh Research Centre has said, "Elon Musk is using the existing tech, developed a long time ago." The centre also unveiled its reusable rocket designed for an attempted mission to Mars. They also claim that the rocket was capable of being re-launched into space 48 hours after landing. 