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Can a Human See a Single Photon? The human eye is very sensitive but can we see a single photon? The answer is that the sensors in the retinacanrespond to a single photon. However, neural filters only allow a signal to pass to the brain to trigger a conscious response when at least about five to nine arrive within less than 100 ms. If we could ...


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The format of the files seems to be described in this file, the content of which I've included below. The annual files (1939-1993) contain the green coronal emission line 530.3 nm observations. The coronal intensities are given in millionths of intensity of the solar disk (coronal units) and converted to the photometrical scale of Lomnicky Stit Station at ...


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I think your question is a reframing of what is known as "Obler's paradox" - namely if the universe is infinite why is the night sky not white, as sooner or later our line of sight hits a star, and even if very far away there would be infinite stars out there. The answer to this is either (a) the Universe is not infinite or (b) the Universe has not been ...


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The most common way to represent uncertainty is with symmetric error bars around a central point. This is in turn commonly interpreted as the 95 % confidence interval. Ie, the actual data point is the centre of a Gaussian which has a width at 95 % of it's height as the size of the error bars. This is only statistical uncertainty and often not explicitly ...



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