How does the appearance of light from a true star differ from that of a planet like Venus due to atmospheric turbulence?

Answer

Stars appear to twinkle due to their light arriving as a single point source, whereas planets exhibit steadier light.

Stars, being extremely distant point sources, scintillate (twinkle) due to atmospheric turbulence, while planets, being closer disks, show a steadier light.

How does the appearance of light from a true star differ from that of a planet like Venus due to atmospheric turbulence?
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