Moon

does the moon spin? careful.

commit to an answer, then watch both moons orbit

The moon does spin — once, exactly, for every trip it makes around Earth, which is why the same face always points at us. A moon that didn’t spin at all would show every side in turn; ours doesn’t, so it has to be turning in lockstep with its orbit.

Concepts: orbits, astronomy.

An interactive you play with one thumb, on Wundr.