Inquisitive kids ask some questions that parents just can’t answer. Astronomer Juna Kollmeier’s son gave her a real stumper one night back in 2014: “Can moons have moons?”
So she went hunting for an answer.
Though NASA has confirmed 3440 planets outside our solar system, no one has ever been able to confirm an exomoon. While we know they're out there, huddling around their respective planets, new research could clue us into why we haven't been able to find one yet -- and it could be because their planets are arseholes.