Could humans someday explore Saturn’s moon Titan, or will humanoid robots do it for us? “Ultimately, we think of Titan as the next big leap beyond Mars.” Training ground In fact, a humanoid robot offered by China’s UBTech Robotics, the Walker S2 is a case in point. It can change its own depleted battery, swapping it out with a fresh, fully-charged battery. That skill mimics IMmortality, Lee said, ...