ANSWERS: 5
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Dust in the atmosphere passing between in and out of you line of sight... It is really dusty out there...
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Refraction in the atmosphere caused by varying temperature and humidity causing random deviations in the light from said object (like stars).
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The temperature differences between the layers of the atmosphere as well as, but to a lesser extent, water vapor, ice crystals in the upper atmosphere and dust in the lower atmosphere.
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Turbulence in the atmosphere. http://curious.astro.cornell.edu/question.php?number=114
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satelites in orbit
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