<p>With exceptional high specific power, i.e., watt/gram and high radiation tolerance, perovskites are poised to be disruptive alternatives for contemporary multijunction solar cells for space photovoltaics. This study performs the theoretical analysis of FAMAPbI₃ perovskite solar cell performance under simulated conditions mimicking various planets. The estimated solar spectrum available above the planet's atmosphere and average temperature are utilized to analyze their applicability as energy generation sources for space missions. The simulation results demonstrate a trend in efficiency across different planets. Solar cell efficiency is lowest under Air Mass 0 (AM0) conditions, corresponding to Earth orbit. Efficiency increases with higher solar irradiance, as encountered near Venus, and can also improve under reduced irradiance conditions, as observed on Mars and Jupiter. Secondly, the performance of the FAMAPbI₃ solar cell in a high radiation environment is simulated using appropriate defect models, which show a reduction in performance, in proportion to both the fluence and the defect introduction rate.</p>