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From which aperture colors in nebulas ?
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07-01-2014, 09:03 PM
doppler
(Rick)
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Join Date: Nov 2012
Location: Mackay
Posts: 1,657
I think a good comparison on eyesight sensitivity would be a laser beam. A 5 milliwatt green laser beam is easily visible but on comparison you need a 250 milliwatt red laser to see its beam.
Rick
doppler
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