As every scientist knows, children generally come up with the best questions. A few years ago, the child of Juna Kollmeier, an astrophysicist of the Carnegie Institution Observatories, asked a great question: "Can moons have moons?" Spoiler alert: It's technically possible, and these "moonmoons" might even exist. But it's not likely.
Can Moonmoons Exist?
A Moonmoon by Any Other Name
Written by Elizabeth Howell October 12, 2018
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