RE: Re: [FH] FTL, astronomy

B Lin wrote:
> 
> Spectra are unique, they are formed by different amounts of various
elements that produce more of one color when burned  A problem arises
when dust, hydrogen or nebula are in the way as they might absorb parts
of the spectra, reducing the usable parts and making ID more difficult.
> 
> You would determine range to a star the same way astronomers currently
do. How do you think they know Alpha Centauri is 4.3 light years away?

Parallax ie triangulation. Works well on nearby stars, not so well on
distant objects.  Actually there are other methods astronomers use on
more distant stars, about which Indy could probably go on at much
greater length than I.

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