It's common knowledge that the Sun is the centre of the Solar System. Around it, the planets orbit – along with a thick belt of asteroids, some meteor fields, and a handful of far-travelling comets.
But that's not the whole story.
"Instead, everything orbits the Solar System centre of mass," James O'Donoghue, a planetary scientist at the Japanese space agency, JAXA, recently explained on Twitter. "Even the Sun."
That centre of mass, called the barycenter, is the point of an object at which it can be balanced perfectly, with all its mass distributed evenly on all sides. In our Solar System, that point rarely lines up with the centre of the Sun.
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