My proposal is to send up a robot, capture a smallish asteroid, and have it use the material to weave/spin out a shield. The robot sits at the edge and spins an

My proposal is to send up a robot, capture a smallish asteroid, and have it use the material to weave/spin out a shield. The robot sits at the edge and spins and weaves away. More robots would be employed as the shield grows. Honestly, I've not worked out all the details. I'd love to hear what others think. Is this just pie(sheet) in the sky? Or is this the salvation of humankind.