scott schrieb:

>> If you look at the emission spectrum of the star and pick a wavelength 
>> where there's little or no emission, it could hypothetically work I 
>> guess...
> 
> "Little or no" emission from a star is probably many orders of magnitude 
> bigger than the biggest ever nuclear bomb on Earth though :-)
> 
> http://homepages.wmich.edu/~korista/sun-images/solar_specbb.jpg
> 
> It may look on there like there is no emission below 100 nm or whatever, 
> but in proportion there is still an almighty amount of x-ray and gamma 
> emission from a star.  Standing out above this "noise" is going to be hard.

Note that the emission of a star is a constant signal to a good degree, 
which probably helps.

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