Find out information about the planet Mercury, the smallest planet in the Solar System. From its geological surface and structure, its exosphere (atmospheric and geological conditions), its planetary rotation and orbit, to theories on Mercury’s formation. Mercury is the closest planet to the Sun, and the smallest planet in our solar system - only slightly larger than Earth's Moon. Mercury is the smallest planet in our solar system. It’s just a little bigger than Earth’s Moon. Mercury itself, though, doesn’t have any moons. It is the closest planet to the Sun, but it’s actually not the hottest. Venus is hotter. Along with Venus, Earth, and Mars, Mercury is one of the rocky planets. It has a solid surface that is covered with craters. Instead of an atmosphere, Mercury possesses a thin exosphere made up of atoms blasted off the surface by the solar wind and ... Mercury is the first planet from the Sun and the smallest in the Solar System. It is a rocky planet with a trace atmosphere and a surface gravity slightly higher than that of Mars.
