Journal article published in 2000 by Guilaine Lagache, Jean-Loup Puget, Alain Abergel, Francois-Xavier Desert, Herve Dole, F.~R Bouchet, Francois Boulanger, Paolo Ciliegi, D.~L Clements, Catherine Cesarsky, David Elbaz, Alberto Franceschini, Richard Gispert, Bruno Guiderdoni, L.~M Matthew Haffner and other authors. Guilaine Lagache, Jean-Loup Puget, Alain Abergel, Francois-Xavier Desert, Herve Dole, F.~R Bouchet, Francois Boulanger, Paolo Ciliegi, D.~L Clements, Catherine Cesarsky, David Elbaz, Alberto Franceschini, Richard Gispert, Bruno Guiderdoni, L.~M Matthew Haffner, Martin Harwit, Rene Laureijs, Dietrich Lemke, A.~F.~M Moorwood, Seb Oliver, W.~T Reach , R.~J Reynolds, Michael Rowan-Robinson, Manfred Stickel, S.~L Tufte

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