1. to measure the stars astronomers measure the wavelength of light coming from the star in question - if the light changes (due to a change in wavelength) they can calculate how the star is oscillating or 'sits' in the universe (how it moves etc.).

So waves change (even if the example was light) if I move an object. Say I had a speaker and I moved it towards the direction of where the sound is going - if I move it quick enough I can change the wavelength...............?

First question - is the above (second) paragraph correct?

Second question - if I follow a soundwave it will be creating lots of other waves as it hits each atom in many many directions - is this true and if so are there equations to help explain/predict it?

Much obliged!

2.

3. Originally Posted by fatman57
So waves change (even if the example was light) if I move an object. Say I had a speaker and I moved it towards the direction of where the sound is going - if I move it quick enough I can change the wavelength...............?
Yes. http://en.wikipedia.org/wiki/Doppler_effect

4. of course...........

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