# Tag Info

## New answers tagged space-travel

7

Yes, but you'll have to go really, really fast. And even then, don't worry about the photons. The relation between velocity $v$ and the observed and "true" wavelength $\lambda_\mathrm{obs}$ and $\lambda$ of the light is $$\lambda_\mathrm{obs} = \sqrt{\frac{1-v/c}{1+v/c}} \lambda.$$ If you consider optical (i.e. visible to humans) light with a wavelength ...

0

In short, the answer to your question is no. Time dilation can't ever run backwards. Consider a simpler case: Let there be a person A on a massive planet, and a person B floating in space far away. If both had huge clocks with them, then B would see A's clock running slower than his own. And although it seems contradictory, A will also see B's clock ...

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