266 B.Defoort,V.Peypoudat,M.C.Bernasconi,K.Chuda and X.Coqueret Fig.4.Concept for a solar sailing spacecraft with four 2,500-m2 saillets.(left);the "Sun Tower"solar power station builds on gossamer structures:supporting tori and flexible Fresnel-lens concentrators (right)(NASA picture) Fig.5.The 1/3-scale model of the ISRS skeleton for the FIRST's thermal shield (right)deployed out of an annular stowage volume around a simulated spacecraft central cylinder (left) and pressurized hangar enclosures capable of holding entire spacecraft during scheduled maintenance/repair activities.The latest US entry in this class in the TransHab concept for a multi-storied habitat [27,28].Activities along this direction have also been started in Europe [29,30.266 B. Defoort, V. Peypoudat, M.C. Bernasconi, K. Chuda and X. Coqueret Fig. 4. Concept for a solar sailing spacecraft with four 2,500-m2 saillets.(left); the “Sun Tower” solar power station builds on gossamer structures: supporting tori and flexible Fresnel-lens concentrators (right) (NASA picture) Fig. 5. The 1/3-scale model of the ISRS skeleton for the FIRST’s thermal shield (right) deployed out of an annular stowage volume around a simulated spacecraft central cylinder (left) and pressurized hangar enclosures capable of holding entire spacecraft during scheduled maintenance/repair activities. The latest US entry in this class in the TransHab concept for a multi-storied habitat [27,28]. Activities along this direction have also been started in Europe [29,30]