Our Solar System comprises the Sun and all the celestial bodies that are held in its gravitational pull. The most significant of these are the planets, the eight largest known objects in the Solar System. The planets have occupied a central place in Mankind’s culture for thousands of years. Each of the planets has its own fascinating characteristics and history. The following is a resource for discovering more about the Earth’s celestial neighbors.
Mercury is the closest planet to the Sun, and one of the four rocky terrestrial planets in the Solar System. Less is known about Mercury than any of the other planets, due to the difficulties in observing the planet from Earth. Mercury’s exterior closely resembles our Moon, but Mercury has an iron core.