What fundamental physical reason allows planets like Venus and Jupiter to display a steady glow instead of twinkling?

Answer

They appear as tiny disks, averaging out atmospheric turbulence

Stars appear as near-perfect point sources, making their light highly susceptible to disruption by atmospheric turbulence (twinkling), whereas planets appear large enough as disks for this effect to average out, resulting in a steady light.

What fundamental physical reason allows planets like Venus and Jupiter to display a steady glow instead of twinkling?

#Videos

How to Find the Planets in the Night Sky - YouTube

astronomyJupiterVenüsobservationplanets