Multiple choice general knowledge science & technology Mercury's period of rotation ( on it's axis) is _______ Earth days 58.65 3 500 5000 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Mercury rotates on its axis once every 58.65 Earth days, which is very slow compared to Earth's 24-hour rotation. This is due to Mercury's 3:2 spin-orbit resonance with the Sun.