I’M NOT SAYING THAT IT’S ALIENS, BUT IT’S ALIENS: Something Weird Is Going on With New Horizons’ Next Target. “Ultima Thule appears to not have a light curve, which is perplexing scientists. . . . Small asteroids like Ultima Thule aren’t perfectly round, which means how much of their surface is facing the Sun changes as they rotate. This means that over the days and weeks that New Horizons has been watching Ultima Thule, it should see the asteroid get periodically brighter and dimmer. This information can tell scientists about Ultima Thule’s size, shape, and speed of rotation. But Ultima Thule isn’t changing its brightness at all. New Horizons has been watching Ultima Thule for three months and hasn’t spotted any brightness change, which is really odd. Ultima Thule is definitely not spherical—astronomers determined that a year ago—so why doesn’t its brightness change?”

Well, it’s a General Products hull.