Stars blink in the night sky because of turbulence in the atmosphere, in a simplistic way the image of a star is basically a point of light in the sky.
When there is an imbalance in the atmosphere (agitation), the star's light is deflected into several different directions. Then the visualization of the star receives small changes in its brightness and where it is located, and with that it starts to blink.
The fact that the Hubble telescope is so effective is due to its staying in space orbit above the planet's surface, bypassing the refraction of light it captures better quality images.
By contrast, stars that do not blink with the naked eye are actually not stars but planets. Your image can be seen because of its size and proximity to Earth.
Do not stop now... There's more after the advertising ;)
Eduardo de Freitas
Graduated in Geography
Would you like to reference this text in a school or academic work? Look:
FREITAS, Eduardo de. "Why do the stars blink?"; Brazil School. Available in: https://brasilescola.uol.com.br/geografia/por-que-as-estrelas-piscam.htm. Accessed on June 27, 2021.
