How to work out the difference between how much energy/radiation the Sun emits per second and how much energy the sun absorbs/receives per second from all the incoming energy/radiation from all the stars? And not forgetting the suns gravitational field is focusing/bending the incoming energy/radiation onto it.



PS. wonder if this could make the universe stay in thermal equilibrium...
PS. if the suns gravity bends incoming radiation, how does it affect our view of space from earth? And have we compensated for it when we determine the distance of objects in space?

From:- http://www.straightdope.com/columns/read/2...rature-of-space
The temperature of space is about 2.7 Kelvin

From:- http://en.wikipedia.org/wiki/Sun
The (effective) temperature of the surface of the Sun is about 5,700K

Here is a black body radiation calculator:-
http://www.spectralcalc.com/blackbody_calc...r/blackbody.php

What does the calculator thingy tell you about the ratio of energy arriving to energy leaving the Sun?

-C2.

The thing tells us that
from space the Sun gains about :-
3.01355e-06 W/m2
and radiates into space about:-
5.98581e+07 W/m2

So the loss of energy to space is about 10,000,000,000,000 times greater than the energy it receives back.

-C2.

it kinda is. (nobody as yet knows whether there will be expansion forever or contraction etc)