This study extends the current knowledge of behavioral intention of space travelers based on motivation and risk antecedents of undertaking a space trip. Using cumulative prospect theory, we develop and test research models to investigate sufficient motivation and risk antecedents on behavioral intention, to explore complex combinations of above antecedents (i.e., causal recipes) leading to both high and low scores of behavioral intention, and to identify necessary motivation and risk antecedents to achieve desired behavioral outcome. The results revealed that although motivations appeared as sufficient and necessary antecedents, risk antecedents play a dominant role such that risks can diminish the effects of motivations in shaping desired behavioral intention of space travelers. Theoretical and practical implications are discussed.