> 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.

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