Two Drifters

As I'm typing this, it's raining here in Munich, the sun is hidden by grey clouds. Yet, apart from my two monitors and some lit up displays of phones, etc. I've got no further artificial light sources. The sun is shining and it's energy, the photons, travel millions of miles to finally hit upon our retinas.

Isn't this wonderful? The sun is shining! Think about it. You are probably taking it for granted. You've becomed accustomed to it, you never give it a second thought, do you?

A real miracle is the sun's constant burning-rate of it's fuel, hydrogen . Why does it not use up the energy in one big blast? Because there are several forces at work! One being the gravitation, which keeps compressing the sun's matter until it "ignites" and starts a fusion reaction. This fusion reaction generates energy and heat, which counteract to the gravity – they tend to expand the sun's matter. Thus, a dynamic balance is preserved until all of the sun's hydrogen has been burned up. This will be the case in about 4 billion years.

What can we learn for the daily lifes of this, I wonder?