Field Programmable Gate Arrays (FPGAs) are sensitive to upsets that occur in aerospace. Drastic device shrinkage, power supply reduction, and increasing operating speeds significantly reduce noise margins and thus reliability; hence the rate of transient and intermittent faults is increased in modern electronic systems. Improving the fault tolerance of reconfigurable devices is increasingly important in domains ranging from mission critical embedded applications to the use of FPGAs in physically remote environments such as satellites. This paper shows the sources of radiation in the space and their effects on FPGAs. Also, main mitigation techniques used to recover from faults in FPGAs are explored.