1. University of Aberdeen, Aberdeen, United Kingdom.
2. Cranfield University, Silsoe, United Kingdom.
3. University of Leicester, Leicester, United Kingdom.
4. Open University, Milton Keynes, United Kingdom.
5. Leiden University, Leiden, The Netherlands.
6. European Space Agency, Noordwijk, The Netherlands.
7. Centro de Astrobiología, Madrid, Spain.
8. Université Louis Pasteur, Strasbourg, France.
9. Imperial College, London, United Kingdom.
10. University of Salzburg, Salzburg, Austria.
11. Carnegie Institute of Washington, Washington, DC.
12. Kiel University, Kiel, Germany.