On November 28, 2022, I photographed Konstantin Batygin at Caltech. We met at the Athenaeum and ended up in his office at South Mudd. He arrived wearing a black shirt, torn jeans, and a biker jacket. Alongside his work as one of the world’s leading planetary dynamicists, Konstantin fronts a rock band called The Seventh Season. The combination feels less surprising once you spend time with him. The same intensity that drives his science seems to flow naturally into everything else.
His office was dominated by a blackboard packed with equations. Chalk covered nearly every available surface. The board was a working map of the outer solar system, filled with attempts to understand forces acting billions of miles from the Sun.
Konstantin is best known for helping develop the Planet Nine hypothesis with fellow Caltech astronomer Mike Brown. The idea emerged from a mystery in the Kuiper Belt, the vast region of icy bodies beyond Neptune. The most distant known objects appeared to be clustered in ways that should not happen by chance. Their orbits seemed to be responding to the gravity of something large and unseen.
The conclusion was startling. A planet perhaps five to ten times the mass of Earth could be orbiting far beyond Neptune, so distant and faint that no telescope has yet found it directly. The evidence is indirect, but the gravitational fingerprints appear to be there. Like the discovery of Neptune in the nineteenth century, the search began not with a sighting, but with mathematics.
As we talked, Konstantin held a bass guitar across his lap as naturally as someone else might rest an arm on a chair. He never played a note. He simply sat with it while discussing orbital resonances, gravitational perturbations, and the architecture of the outer solar system. Behind him, equations stretched across the blackboard. The guitar felt less like an instrument and more like another part of the landscape of his thinking.
During the shoot, he told me that museums occasionally preserve his blackboards by spraying them with fixative and carrying them away as historical artifacts. Once a board is gone, he simply picks up a fresh piece of chalk and starts again. Somewhere in the darkness beyond Neptune, a possible planet remains unfound. The calculations continue.
