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The proof
All galaxies are moving away from use (think of blowing up
a balloon with stars on it)
Distant galaxies are moving faster
We receive microwaves from all parts of the universe
(thought to be `shock waves' for the big bang)…read more

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How do we know galaxies are moving?
The Doppler Effect
You have all probably experienced the Doppler Effect
When a police car is coming towards you sounding its siren,
the pitch (frequency) appears to increase
When it passes and moves away from you, the pitch
suddenly decreases
A stationary police car with its siren sounding sends out
circular sound wave fronts…read more

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But if the police car is moving, it has changed position
between the time it produces one note and the next
The car is moving away from the person in at A
The wavelength appears longer so the pitch is lower
The reverse is true for the person at B
The wavelength appears shorter so the pitch is higher
Exactly the same thing happens with light
The longer the wavelength shifts colours to the red end of
the spectrum
The Doppler effect can be used…read more

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Life cycle of a star
Life cycle of a star ­ Words I may not know…read more

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Interstellar ­ between stars.
Protostar ­ `pre-star'.
Nuclear fusion ­ when hydrogen atoms join, lots of energy is
released
Main sequence star ­ adult star.
Supernova ­ exploding star.…read more

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