A greater amount of infrared radiation implies a larger amount of cooler material surrounding the star, which indicates that it is still coalescing. 紅外線輻射越是強烈，表示星體周遭有越多溫度較低的物質，也就是說這個星體還在形成階段的初期。
Radiative forcing is defined as a change in average net radiation at the top of the troposphere tropopause due to a change in either solar or infrared radiation. 輻射力的定義是由於太陽或紅外線輻射份量的轉變而引致對流層頂部的平均輻射改變。
