habitable planets atmospheres colors

[felipe]

do EVERY habitable planet that is like earth and has life has only blue atospheres? like our planet has blue skies because the nitrogen rich and some peolple says that is ozone so this is my question

[felipe]

*atmospheres

[SyzygyΣE]

This really isn't an easy question to answer as it depends on many factors, such as the thickness of the atmosphere, the types of particles present and even the type of star because different stars emit different parts of the visible spectrum. We've found exoplanets expected to be blue that are incredibly hostile. I'm not expert in this but here are some links that may be of help.

https://physics.stackexchange.com/questions/164490/could-the-sky-on-a-planet-theoretically-be-any-color
https://www.sciencealert.com/earth-s-light-blue-colour-could-be-a-signature-of-life