Planets......please twinkle!

Classical Mechanics Level 1

Stars in the night sky twinkle, but planets do not.

Why?

Unlike stars, planets emit light of constant intensity Stars are farther away and look smaller, so fluctuations due to the atmosphere are highly noticeable Planets emit a greater amount of light, so small variations in the intensity are not noticeable Planets' distances from Earth do not change with time, resulting in a constant stream of light