A tidally locked planet does not rotate in relation to its sun. One side is always day, one, always night. This is caused by tidal forces pulling all planets towards this same equilibrium, so it’s completely stable once it does occur…a tidally locked planet at an earthlike distance from the sun would be scorching heat on one side, freezing ice on the other.
What about at different distances? Is there a band of orbital distance where the night side of a tidally locked planet is warm enough for liquid water? Or one far away enough that the day side can have oceans?
Who knows, maybe life is possible on the ring of twilight where it’s not too hot and not too cold. The planet where the Twi’leks in Star Wars are from is that way. Always sounded plausible to me.
Been doing some googling. Most stars are dwarf stars, and the habitable band of a red dwarf is so close the tidal forces are way stronger. It might turn out that most habitable planets are tidally locked.
There’s a book called The City In The Middle Of The Night that takes place on a tidally locked planet. It has politics, science fiction, and lesbians.
My favorite things!
It also kinda makes you feel like shit, but in a really good way.
Even better