Sunlight-Powered Spacecraft Set to Launch Aboard SpaceX Rocket

cosmos – v. the whole universe

advance – v. develop or progress

momentum – n. the force that something has when it is moving

reflect – v. send back or bounce off

paper clip – n. small piece of metal used to hold pieces of paper together

thrust – n. upward push or force

navigate – v. find the right direction to travel by using maps or other equipment