You know that some animals make it through a long winter by hibernating, which reduces their body temperature and energy expenditure. Some smaller animals, like the 8.5 g Australian fairy wren, does this on a daily basis, allowing their body temperature to drop at night to reduce heat lost to the environment. On a 3 degree C night, a wren lets its body temperature drop from 42 degree C to 30 degree C.

By what factor does this reduction in temperature reduce the energy lost by radiation? Express your answer using three significant figures.