4: The Sun and the Cosmos

Figure 4.1
zero entropy solar energy source

We are going to keep things as simple as possible. We can introduce real-world complications later.

First, we specify the environment through which our populations and their circulations must pass.

We need a source of solar radiation. So we imagine an ideal and eternal sun up in the sky. It is everlasting and changeless. Since it never changes in its state, its entropy also never changes.

But the sun must of course shine into something. So as in Figure 4.1, we imagine a cosmos whose free space has a temperature that is always at the absolute zero of temperature. It does not matter how much our sun shines, the cosmos absorbs all radiation. Our free space never gets any warmer. It is therefore like our sun and never changes in its state. Its entropy also never changes.

And now that we have some outgoing solar radiation pressure our biological populations can use all about their circulations, and a cosmos to hold them all, we can turn our attention to our earth.