On 21 May 2016 at 0:38, Tim wrote:

> On Fri, May 20, 2016 at 07:22:08AM -0700,  (via tml list) wrote:
> > On 19 May 2016 at 10:43, Craig Berry wrote:
> > > Could one jump a J-1 ship two parsecs by accelerating to a
> > > velocity with tau=0.5 in its direction before jumping?
> >
> > Well, it'd take two weeks according to external observers.
>
> Worse than that; it could take anywhere between 342 weeks and -340
> weeks, depending upon direction of jump compared with velocity vector.

But only the "it took two weeks" observers would say that the ship
had a tau of 0.5   :-)

> FTL really messes up with relativity.

It complicates things. But sometimes the complications are useful.
Other times they are highly... annoying.

--
Leonard Erickson (aka shadow)
shadow at shadowgard dot com