Planets do not blink in the night sky. Blinking is a characteristic exhibited by stars, which is caused by variations in the Earth's atmosphere. Stars appear to twinkle or blink due to atmospheric turbulence, changes in air density, and temperature fluctuations. Planets, being much closer to Earth and considerably larger in size compared to stars, do not exhibit this blinking behavior. The movement of planets across the sky is also much slower compared to stars, so they appear to move smoothly without any noticeable flickering or blinking.