Probably they refer to stars with potentially orbiting planets. Today
there is no technology to directly observe exoplanets in sufficient
detail to obtain the data.

The emissions of civilizations around the stars would be seen by us
mixed with the star's spectra.

Isaac



Em 12/10/2016 09:48, Justin Richards escreveu:
> Can I assume that the use of "star" is a general term to describe planets
> or do they intend to refer to stars.
>
> On 12 October 2016 at 09:31, David VanHorn <microbrix@gmail.com> wrote:
>
>> Agreed.  It's not over till it's over but this is interesting.
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