Why don't the planets twinkle? I want the answer in easy language
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Planets shine more steadily because … they’re closer to Earth and so appear not as pinpoints, but as tiny disks in our sky. You can see planets as disks if you looked through a telescope, while stars remain pinpoints. The light from these little disks is also refracted by Earth’s atmosphere, as it travels toward our eyes. But – while the light from one edge of a planet’s disk might be forced to “zig” one way – light from the opposite edge of the disk might be “zagging” in an opposite way. The zigs and zags of light from a planetary disk cancel each other out, and that’s why planets appear to shine steadily.
Bottom line: Stars twinkle because they appear as tiny pinpoints as seen from Earth, even through telescopes. Planets don't twinkle because they are closer, and thus appear larger in our sky, as tiny disks instead of pinpoints.