Our understanding of the universe is changing all the time. There are many different theories on how the universe was made and how it is structured.
Ancient Greeks believed that there were only four elements (Earth, Air, Fire & Water). We now know of over one hundred elements although the Greek theory could still describe four states of matter (Solid, Gas, Plasma & Liquid respectively).
This section contains a range of theories and other information tailored to help give you a good understanding of physical principles. An important point to note is that most of this section covers theoretical physics and should not be taken as absolute fact.
Theoretical models have to be re thought on a regular basis as new and fascinating discoveries are made. It is our aim to provide both sides of every story so that we remain unbiased, allowing you to make your own judgment.