White dwarfs have a surface, with 50km of crust. And they cool. They have a hydrogen atmosphere. Life doesn’t take very long to appear, perhaps just a few mill

White dwarfs have a surface, with 50km of crust. And they cool. They have a hydrogen atmosphere. Life doesn’t take very long to appear, perhaps just a few million years. We keep revising the number down on earth. It’s possible, and perhaps even likely, that most white dwarfs host life at some point in their lifecycle, when they’re cool enough.