This colored shot from the space probe shows the broken features of the planet's surface.

The planet Mercury is buckling as it’s core cools and shrinks, but scientists say cliffs and tears across the planet's surface are nothing to be concerned about since it has lost only 3 miles of its 9,000 mile diameter in four billion years - not a big loss, but bigger than they had expected.

The crater Caloris in the middle of its hardened sea of lava.

Information sent by  space probe Messenger revealed how four billion years ago volcanoes poured out seas of lava which later hardened and split into large plateaus rimmed by cliffs.

It was also discovered the Mercury’s magnetic field is generated by a spinning mostly molten iron core similar to the Earth ending a scientific dispute about the nature our planet and one of the secrets of the universe.