Let’s say we’ve moved some time into the future, when interstellar space travel has become commonplace. You’re on board a Virgin Galactic or SpaceX or Blue Horizons or Heinlein Enterprises flight down to Nimbus, in a solar system in the Orion constellation, when you look down at your destination and . . . it’s a planet that looks like a giant, unblinking eyeball against the dark, star-filled sky.
That would make your cool little space voyage even cooler, wouldn’t it?
Scientists believe that there may be “eyeball planets” out there, just waiting to be visited. They would look like eyeballs because they would be tidally locked with the star they are circling, so one side of the planet always faces the star — just like one side of the Moon always faces the Earth, so that we Earth dwellers never get to see the Dark Side of the Moon. In such circumstances, the “light side” of the planet facing the star and absorbing the brunt of the sun’s radiation, heat, light, and solar wind, is bound to be a lot different than the “dark side” — hotter than the dark side, for sure, and probably different in other ways, too.
Scientists theorize that there could be at least two kinds of eyeball planets out there, and probably more. Hot eyeballs would be planets located close to their sun, where the sun side is totally dry because the heat has caused all of the moisture on that side to evaporate, and the dark side is one enormous ice cap — with a temperate ring caused by melting ice, in perpetual, unchanging twilight, separating the two sides. Icy eyeballs would be farther away from the star, where the dark side would be one huge glacier but the sun side would still have liquid water — perhaps with a few islands and continents thrown in for good measure, just to give the eye an even creepier appearance.