Physics Help Forum Which transfers more heat as a whole in the universe?

 General Physics General Physics Help Forum

 Jan 5th 2015, 12:27 PM #1 Junior Member   Join Date: Jan 2015 Posts: 2 Which transfers more heat as a whole in the universe? Which transfers more heat as a whole in the universe? Conduction vs radiation The most obvious guess is radiation due to stars. Conduction seems to be considered negligible in stars but I've only read that in the context of energy transport to the surface and not necessarily just back and forth from inside of the star. I've been having some issues finding a good source for an answer. I just made a new account to ask the question due to a friend--not expecting much. Thanks for reading!
 Jan 5th 2015, 01:00 PM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,352 I would agree with you - the only way that heat is transferred through the vacuum of space is by radiation. However - you make a good point that all that radiation comes from the surface of stars, and there must be a mechanism that transmits heat from the interior of the star to its surface. But that mechanism is primarily convection, not conduction. So - given the choice of conduction versus radiation, I would choose radiation. One other point - the stars are not the only source of radiation in the universe. Consider the existence of the microwave background radiation, the famous 2.7 Kelvin black body radiation.
Jan 5th 2015, 03:40 PM   #3
Junior Member

Join Date: Jan 2015
Posts: 2
 Originally Posted by ChipB I would agree with you - the only way that heat is transferred through the vacuum of space is by radiation. However - you make a good point that all that radiation comes from the surface of stars, and there must be a mechanism that transmits heat from the interior of the star to its surface. But that mechanism is primarily convection, not conduction. So - given the choice of conduction versus radiation, I would choose radiation. One other point - the stars are not the only source of radiation in the universe. Consider the existence of the microwave background radiation, the famous 2.7 Kelvin black body radiation.
Thanks for the reply. I was aware that convection plays a much bigger role in transferring heat to the surface of a star but was still wondering if the 'back and forth' conduction moved transferred more heat even if it ultimately wouldn't really end up anywhere.