why does the earth not become as hot as the sun although it has been receiving heat from the sun foe ages?

@shubham 
earth have also mechanism to escape out the heat , its enviornment emit certain kind of radiation in forms of heat in night and it becomes cool down again in night . 
so, the heat that it receives in the morning and day time , it sent back that in the night in the form of radiation . 
in summer time or polluted area , global warming happens , due to trapping of heat in the surface of earth . 
HOPE IT HELPS .