There are about 1000 asteroid and comet researchers around the world. Dr Alan Harris from the DLR Institute of Planetary Research in Berlin is one of them. With a Doctorate in Physics, this 'Senior Scientist' at the German Aerospace Center's (Deutsches Zentrum für Luft- und Raumfahrt; DLR) Berlin-based Institute of Planetary Research (Institut für Planetenforschung) works in the 'Asteroids and Comets' department. As a scientist, he knows that his research will always lead him to surprises and questions. "I'll find that out at a later date – right now it's still unknown to me," he says with a grin. Even after 30 years of professional experience, Dr Harris believes that the ability to remain inquisitive and to be positively motivated about things is as important to a researcher as luck and good fortune.