There's a crapload of debris orbiting our planet and potentially posing a hazard to our astronauts and our satellites. One estimate says there are 21,000 pieces of space junk larger than 10 centimeters, that could collide with other objects at velocities ten times faster than a bullet. How do we get it down? You can't just grab any old space debris with claws, and even if you could, grippers can be unwieldily. So a team of scientists thought, what about sticky stuff?