Red Shift

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  • Created on: 05-05-13 18:44
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RED SHIFT
The Doppler Effect is the change in observed wavelength and frequency of waves
because of the motion of the source of waves.
We can found out lots of things about stars and galaxies by studying the light from
them. We can use a prism to split the light into a spectrum. The wavelength of light
increases across the spectrum from blue to red. We can tell from its spectrum if a
star or galaxy is moving towards or away from us. This is because:
The light waves are stretched out if the star or galaxy is moving away
from us. The wavelength of the waves is increased. We call this is a RED
SHIFT because the spectrum of light is shifted towards the red part of
the spectrum.
The light waves are squashed together if the star or galaxy is moving
towards us. The wavelength of the waves is decreased. We call this BLUE
SHIFT because the spectrum of light is shifted towards the blue part of
the spectrum.
The bigger the shift, the more the waves are squashed together or stretched out. So
the faster the star or galaxy must be moving towards or away from us. In other
words:
THE FASTER A STAR OR GALAXY IS MOVING TOWARDS OR AWAY
FROM US, THE BIGGER THE SHIFT IS!
In 1929, Edwin Hubble discovered that the light from distant galaxies was red shifted, and
the further the galaxy is from us the bigger the red shift. He concluded that the distant
galaxies moving away from us, and that the greater the distance a galaxy is from us, the
greater the speed is at which it is moving away from us. Therefore the WHOLE UNIVERSE IS
STILL EXPANDING.

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