Re: opposite of relativistic time contraction

IsaacKuo wrote:
> The main star****p could be accelerated with a stupendously
> powerful X-ray laser (which could have intergalactic range--a
> 0.83nm X-ray laser focused by a 40000km diameter aluminum
> zone plate could focus onto a 1000km target out to four million
> light years).

If X-rays are troublesome, perhaps you could use a Nicoll-Dyson laser 
instead. IIRC, a phased array of visible-light emitters 2 AU in diameter 
can focus their beam on an Earth-sized target from intergalactic range, 
so I imagine they could do something much smaller close up.