. "radiational cooling" . . "heat radiates" . "radiates it as heat" . "radiative" . . "Radiative cooling" . . . . . "nocturnal radiation" . "passively cool" . "longwave cooling" . . . . "Radiative cooling" . "radiation" . "radiative cooling" . . . . "radiatively cooled" . "cool by radiating heat" . "allows them to cool" . "radiative device" .