The Central Powerhouse

The Sun, the central powerhouse of our solar system. A medium size, yellow star, composed principally of hydrogen - the lightest chemical element in the universe. Through a process of nuclear fusion - the union of atoms, the Sun forms denser atoms, releasing energy and heat in the process. This energy and heat radiates out, in all directions through the vacuum of space. All the planets in our solar system, intercept a small amount of this energy and heat, as they rotate around their axises and orbit around the Sun. The energy travels at the universal speed limit - known as the speed-of-light (c): which is approximately 3 x108 metres per second. Earth is just under 150 million kilometres from the Sun, and so it takes 8.3 minutes for energy leaving the Sun's surface to reach Earth's atmosphere.

To find out more about how energy, light, and heat is generated in the Sun, and what the resulting light, energy, and heat actually is, then dive into the blog posts below. The chronological order also has some sense in the order of understanding: starting off with simpler concepts at the beginning (at the bottom of the page), and becoming more complex as time goes on (near the top).

Light: Life’s window to the world

The Sun
Electromagnetic Energy is not only the primary source (or secondary source after gravity…) of energy on Earth, ‘light,’ the smaller fraction of the electromagnetic spectrum, is also an important source of information for many forms of organisms. The different properties of light, such as

Electromagnetic spectrum and emittance

The Sun
EM Spectrum The Sun emits electromagnetic radiation in many different wave lengths. The actual EM radiated by the Sun, is known as the solar spectrum, and is made up of some ultraviolet (A, B, and C), but

Waves, particles, and duality

The Sun
Waves There are two main types of waves, mechanical waves and electromagnetic waves: and these are the main ways that energy moves from point A to point B: in other words, all waves transport energy

Electromagnetic radiation, an introduction

The Sun
The energy and heat that reaches the Earth ultimately comes from the Sun, with vastly smaller

The journey of energy out of the Sun

The Sun
This section goes into more detail on some of the main zones (differentiated by the main form of energy transfer taking place), between the core and the Sun's outer surface; describing the main reactions, occurring as energy slowly travels outwards, before finally being