How Fast Is Mercury's Orbit?

Mercury orbits the Sun at 47,400 m/s — the fastest planet, completing 4 orbits for every Earth year. Its closeness to the Sun forces this speed; orbital velocity is set by the parent body's gravity at that distance.

Mercury's year is just 88 Earth days — and you experience 4 Mercury years for every Earth year that passes.

• 4× faster than Voyager 1
• Year lasts 88 Earth days