A map of the Mid-Atlantic Ridge. The Mid-Atlantic Ridge (MAR) is a mid-ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world.
Since the distances are so large, we usually express them in Astronomical Units (AU). (An AU is the average distance from Earth to the Sun, about 150 million kilometers or 93 million miles.) The table below lists the distance of each planet from the Sun in AU. (Numbers were taken from this page.)
How far is Mercury away from the sun? Astronomers convert large distances such as these to astronomical units. An astronomical unit (AU) is 93 million miles, which is the average distance from the sun to Earth. In this regard, Mercury's average distance from the sun is 0.387 AU. To put this into perspective, Neptune's average distance from the sun is 30.1 AU. The closest Mercury comes to Earth during its orbit is 48 million miles.