[jeremiah]

But the radiation coming from the sun, strikes the Earth causing the heating of the planet. It does not cool the sun though.

[PatrickHenry]

But the radiation coming from the sun, strikes the Earth causing the heating of the planet. It does not cool the sun though.

It's irrelevant that it strikes the earth. I only mentioned that so you might see that radiation leaves the sun and travels through the vacuum of space. If the sun stopped burning, it would cool off because its heat would radiate away.

[sd-joe]

"But the radiation coming from the sun, strikes the Earth causing the heating of the planet. It does not cool the sun though."

Of course it does. Inside the sun are massive fusion reactions creating mega energy, some in the form of heat, every second of every minute of every day. The sun's surface maintains a somewhat even temperature by radiating off enough heat to balance the heat being generated. If it did not cool off, the temperature of the sun would go up and up and up to infinity.

Actually heat can be transfered by three methods,
conduction, convection, and radiation. Although a vacuum will not conduct heat, it will pass radiation.

[Doctor Stochastic]

But the radiation coming from the sun, strikes the Earth causing the heating of the planet. It does not cool the sun though.

Yes, it does. Else the sun would be much hotter.

[Dan Day]

But the radiation coming from the sun, strikes the Earth causing the heating of the planet. It does not cool the sun though.

Actually, yes it does. It's just that the Sun is always producing yet more heat which it has to get rid of.

But if the sun were to be "turned off" tomorrow, it would cool, as its heat level was contantly being radiated away for the next few hundred years (at least).