Multilayer Insulation (MLI) is used to minimize temperature gradients throughout the spacecraft satellite and to control heat transfer rates. MLI blankets work in both ways: they prevent both excessive heat loss from a satellite component and also prevent excessive heating from the external environmental fluxes, rocket plumes, and other sources. Most spacecraft flown satellites today are covered with MLI blankets, with cutouts . Cutouts are provided at places for areas where radiators to reject internally generated waste heat. Single-If lesser thermal insulation is required, single layer radiation barriers are sometimes may be used , in place of MLI where less thermal insulation is required, since they are lighter and cheap to manufactureand also lighter. <br \>In practice, simply just by increasing the number of layers past beyond a certain value will not improve , performancecannot be improved. As the no. number of layers increases, radiative heat transfer becomes small compared with to conductive “shorts” between layers and other losses. Taking all these factors into account, about About 25 layers are usually suffice sufficient to obtain a minimum overall conductance value.