Thermal Radiation Steady-state
Most recent answer: 05/27/2017
- Bill (age 40)
Menomonie, WI USA
You guessed it- something orbiting the Sun (e.g. us) loses the energy by blackbody radiation. Of course, real objects aren't quite perfect blackbodies, so they are more efficient at exchanging thermal radiation in some frequency ranges than others. Since the Sun's radiant energy mostly arrives in the visible range and the Earth's radiant energy mostly leaves in the infrared, the amount the Earth has to heat up to keep the outflow equal to the inflow depends on how much different frequencies are reflected and absorbed on the surface and in the atmosphere. That's why the greenhouse effect helps warm the Earth and why increasing it by adding more infrared-absorbing gases to the atmosphere will warm it too much.
Mike W.
(published on 05/27/2017)