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= = =In 1814 Joseph Von Fraunhofer noticed that when a glass prism spilt sunlight into colours, there were black bands in the spectrum.=

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==The big bang theory accounts for why the light from the galaxies is red shifted and why the further away the galaxy is, the greater is the red shift. It explains the possible starting point of the universe and its age.==

It explains how the universe may have developed:

 * **A very hot universe that appeared 15 billion years ago, at a single point.**
 * **It expanded rapidly and cooled at the same time.**
 * **Atoms (mostly hydrogen) formed when the temperature dropped to about 3,000°c.**
 * **Gravity clumped hydrogen atoms into galaxies and stars.**

The universe is filled with microwave radiatio. This is because the radiation left over from the big bang has been stretched from very short wavelength gamma radiation to centimeter-long microwave radiation as the universe expanded.