The innermost planet in our solar system, Mercury, is also the smallest planet in the system slightly larger than our Moon. Compared to Earth, it is 1/3 in diameter and the mass of Mercury is only 5.5 percent the mass of Earth. Just to put a scale on how small Mercury is, you could fit more than 24,400 Mercury’s inside one Jupiter, the biggest planet in the solar system. Although the exact date of Mercury’s discovery is not known, it is one of the planets visible by naked eyes and was first observed by telescope by Galileo Galilei in the…