HD 131399Ab eventually gets to a point in its orbit—when it’s along a path between the three suns—in which it experiences near-constant daylight. That’s because the monster-sun is rising from one horizon as the smaller two suns are setting at the other.

Much of the time, though, HD 131399Ab’s orientation to its three suns is such that it gives the planet a sunny side and a dark side. This arrangement—daytime on one side, nighttime on the other—is the way things are on HD 131399Ab for most of the year. A year for the planet, however, lasts the equivalent of 550 Earth years.

Wow. Glorious. Can you even imagine this?