Multimedia presentation about The Planetary Society Solar Sail Project accomplished on the 'Memorial Aeroespacial Brasileiro' auditorium in São José dos Campos, São Paulo, on December 10th, 2005. This lecture, with admission free, was supplied by José Roberto de Vasconcelos Costa, National Coordinator in Brazil, closing the III Ciclo de Palestras ABCAer/AAB, a series of lectures with prominence professionals in the past and present of the Brazilian aerospace activities.