Re: time dilation and doppler



wespe@xxxxxxxxxxxxx wrote:
> Hi,
> I'm wondering if there is a certain relative speed for two objects
> (moving towards each other) at which doppler effect cancels out the
> time dilation effect? That is, the speed of events look normal, but
> only the observed light gets blue shifted. Whould such a speed have a
> significance? Thanks.

xxein: No. The pure Doppler effect always has a greater significance
than time dilation. It's like 'add one and subtract.1' or 'subtract 1
and add.1'. It is always positive or always negative to your rest
frame.

.

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