It’s interesting to look at an idea for humanity that isn’t driven by necessity, disaster, or damage control; to look at it from another angle. And as well as being an interesting concept, the extremes and unknowns of life on other planets also provides rich ground for creative thinking. Here, in The Atlantic, author Charlie Jane Anders not only muses on the creative solutions for adapting to life elsewhere, but discusses how it even inspired her new novel.
Imagine going to live on a planet where the sun never moves in the sky. No sunrise, no sunset.
Several years ago, I became obsessed with tidally locked planets. The notion of a world permanently caught between two extremes—with one half always illuminated, the other always in the dark—took hold of my imagination. I realized that planets like these were the surest bet in the search for Earth-like places that our descendants could settle on. Worlds of eternal darkness and never-ending sunlight could be the future of the human race—if we’re serious about living in other solar systems.
Astronomers believe that most of the planets in our galaxy that have Earth-like temperatures are likely to be tidally locked. Because their orbital period is the same as their period of rotation, these planets will always present the same face to their sun—just as we always see the same side of the moon, as it orbits Earth.
And the reason for this glut of tidally locked worlds is pretty simple. Up to three-quarters of suns in our galaxy are red dwarfs, or “M-dwarfs,” smaller and cooler than our sun. Any planet orbiting one of these M-dwarfs would need to be much closer to its star to support human life—as close as Mercury is to our sun. And at that distance, the star’s gravity would pull it into a tidally locked orbit.