The+Doppler+Effect

=**The Doppler Effect - //' The way the universe expands'//**=

The Universe is vast. But scientists have shown the universe is still expanding. But how did they find out???

Scientists did a little test on volume. This was the result: If you are behind an ambulance the pitch of the ambulance siren will be low while if you are in front of an ambulance the pitch will be high. It shows the effect of sound and how it can relate to the universe. The change of pitch is known as the Doppler Effect which was created by Austrian physicist, Christian Doppler in 1842.

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This theory applies to light. However rather than a change of pitch there is a change of colour. This is known when a thin beam of white lights enters a triangular prism, it refracts into many different colours known as the visible spectrum. When light gets streached, its wavelength changes causing the colour it change.

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Astronomer Edwin Hubble studied the movement of dark lines inside the light which is emitted by a star or a galaxy. Scientists have discovered that due to the impact of these dark lines, which expands the universe. In 1929 Hubble noticed that the further a galaxy was, the faster it would move. This is now known as Hubble's law.

Because of this fact, scientists know that the universe is expanding.

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