[ntp:questions] OT: high-accuracy atomic clock to be attached outside of the International Space Station

[unruh]

On 2009-12-15, David J Taylor <david-taylor at blueyonder.delete-this-bit.and-this-part.co.uk.invalid> wrote:
> ...an agreement that paves the way for the launch of a high-accuracy 
> atomic clock to be attached to the outside of the European Columbus 
> laboratory onboard the International Space Station (ISS).

They have high accuracy atomic clocks orbiting up there already (GPS,
Galileo,...) What is significant about this?

>
> See more:
>   http://www.esa.int/esaCP/SEMRDI9K73G_index_0.html
>
> David 
>