LASSIE's robot dog may join astronauts on Mars

Breakthroughs, discoveries, and DIY tips sent every weekday. When humans eventually set foot on Mars, they may have a four-legged companion by their side. But the dog accompanying them won't be a canine at all, but a quadruped robot designed to gather samples and keep astronauts on the Red Planet from twisting an ankle. Built with autonomous capability, it will be capable of operating independently of humans. Put another way, the Mars dog will walk off-leash.