How could life survive on tidally locked planets? 

 Astronomers are especially interested in the habitability of these kinds of planets, which always face their star with the same side, because they are incredibly common in the universe.  

https://cdn.mos.cms.futurecdn.net/ciHgL9mcQBLMskbxDaxiGg.jpg

https://www.space.com/how-can-life-surive-on-tidally-locked-worlds