Imagine having to develop tyres for a vehicle to be used in outer space. The challenging list of requirements would include such tyres being as light and strong as possible, resistant to punctures and capable of providing good traction in all environments and temperatures. Nasa is reinventing the lunar wheel with a new airless spring tyre using nickel titanium as the metal. Although spring tyres have been used before on lunar vehicles, they have struggled with structural deformation under severe punishment. The solution is a new material known as memory-shape alloy capable of returning to its original form after great deformation. Who knows, someday this sort of tyre could become an option for your SUV?