What's this
I will give the answer on 15-2-2015.
Hint: it is a spectrum of something (not celestial)
It is the spectrum of an energy saving lamp in a street lantern, so Hans, congratulations
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Taken on Thursday February 5, 2015
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Posted on Sunday February 8, 2015
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5 comments
uwschu said:
Bin gespannt!
Gruß Uwe
cammino said:
Erika Akire said:
Gisela Plewe said:
Unwissenschaftlich: Komet mit roten Schweif??????????
cammino said: