Is the density of photons per unit area emitted by a distant star finite and can the Earth skip past 4 neighboring photons? We won't see the light from the star?

Answer from: alice2014:
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We will see the light from the star by increasing the exposure time. The light flux from a star at the observation level (usually outside the atmosphere) is determined by the number of photons detected per unit area per unit time. Dimensionality is [(number of photons):(cm²-s) ]. Thus, a small number of photons from a distant star per unit time, for a given detector area, can be compensated by a long exposure time of the star (days, weeks and even months).

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