Wubbo Johannes Ockels was a Dutch physicist, astronaut, pilot and professor. On October 30, 1985, he was the first Dutchman in space when he participated in a flight on the space shuttle Challenger, STS-61-A. This experience affected him deeply and when he came back he put a lot of effort into safe ways of preserving the Earth and methods of producing safe energy. Until his death in 2014, he was Professor of Aerospace for Sustainable Science and Technology at the TU Delft Faculty of Aerospace Engineering. Ockels died in 2014 of an aggressive form of kidney cancer. Until his very last day of his life - some say with his last breath - he spoke of our responsibilities: Save the earth, well now!