On 11th February 2008, ESA astronaut Hans Schlegel was supposed to take part in a space walk, but because the 56-year-old German did not feel well he remained inside the spaceship. He subsequently recovered and was able to work outside the ISS on 13th February. An ESA announcement stated that he had been the victim of space sickness – dizziness and illness due to weightlessness, a problem faced by many astronauts while adapting to zero gravity. Gravitation biologist Dr. Ralf Anken of the University of Hohenheim talks about his research with fish in an interview with Sandra Leppin from Hohenheim University.
Although medicaments are available, the disease cannot be cured – in principle, the brain has to learn to rely on visual information. Humans are likely to go through the same experience as the fish who eventually learn to rely on their eyes rather than on their sense of equilibrium.