Originally posted by robodweeb
You're joking, right? No one can be that silly. That it's true that planets don't seem to twinkle in the same way that stars do is simple geometry and inverse square law. Stars are further away, so fewer photons make it all the way into the angle subtended by our eyes. Refraction effects in the atmosphere transiently disturb their paths from our eyes and they seem to twinkle. Planets are closer, so significantly more photons reach our eyes and the impact of those same atmospheric effects on what we perceive is swamped by all the other photons ... so we don't notice the twinkling as much (though planets *do* twinkle with enough turbulence and enough refractants suspended in the atmosphere).
Whether we notice it or not, atmospheric effects are a direct cause of twinkling ...