This is very cool. Dr. Young Bae demonstrated a workable photonic laser thruster (PTL). That's a propulsion system that uses a laser. It can theoretically be scaled up to send a spaceship to Mars in a week, or create exact movements so they can string a bunch of satellites together to make a big telescope. Or maybe a big laser that can kill people from space. Ok, don't like the last one, but it's still really cool. Mars in a week. Once we get a space elevator going, Mars is gonna get lots of people.