Planets do not twinkle in the night sky, unlike stars. The twinkling or scintillation of stars is an effect caused by the turbulence in the Earth's atmosphere. When light from a distant star passes through the atmosphere, it encounters pockets of varying temperature, density, and movement. This causes the light rays to bend and interfere, creating the appearance of twinkling.

On the other hand, planets are much closer to Earth compared to stars. Their light does not have to travel as far and is therefore less affected by the Earth's atmosphere. Planets emit a steadier and more consistent light, making them appear as steady points of light in the sky without the twinkling effect observed in stars.