A NASA astronaut was caught with his pants down in space whilst challenging himself to float back into his trousers during a bizarre experiment. Don Pettit was seen orbiting the International Space Station (ISS) half naked after the public challenged him to put on a pair of trousers by floating into them. While astronauts and objects in the ISS appear weightless because they are in a constant state of free fall, directing their movements towards a specific area can be particularly challenging.